WSL2-Linux-Kernel/drivers/acpi/acpica/nsxfname.c

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C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name: nsxfname - Public interfaces to the ACPI subsystem
* ACPI Namespace oriented interfaces
*
* Copyright (C) 2000 - 2019, Intel Corp.
*
*****************************************************************************/
#define EXPORT_ACPI_INTERFACES
#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "acparser.h"
#include "amlcode.h"
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME("nsxfname")
/* Local prototypes */
static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
struct acpi_pnp_device_id *source,
char *string_area);
/******************************************************************************
*
* FUNCTION: acpi_get_handle
*
* PARAMETERS: parent - Object to search under (search scope).
* pathname - Pointer to an asciiz string containing the
ACPICA 20050408 from Bob Moore Fixed three cases in the interpreter where an "index" argument to an ASL function was still (internally) 32 bits instead of the required 64 bits. This was the Index argument to the Index, Mid, and Match operators. The "strupr" function is now permanently local (acpi_ut_strupr), since this is not a POSIX-defined function and not present in most kernel-level C libraries. References to the C library strupr function have been removed from the headers. Completed the deployment of static functions/prototypes. All prototypes with the static attribute have been moved from the headers to the owning C file. ACPICA 20050329 from Bob Moore An error is now generated if an attempt is made to create a Buffer Field of length zero (A CreateField with a length operand of zero.) The interpreter now issues a warning whenever executable code at the module level is detected during ACPI table load. This will give some idea of the prevalence of this type of code. Implemented support for references to named objects (other than control methods) within package objects. Enhanced package object output for the debug object. Package objects are now completely dumped, showing all elements. Enhanced miscellaneous object output for the debug object. Any object can now be written to the debug object (for example, a device object can be written, and the type of the object will be displayed.) The "static" qualifier has been added to all local functions across the core subsystem. The number of "long" lines (> 80 chars) within the source has been significantly reduced, by about 1/3. Cleaned up all header files to ensure that all CA/iASL functions are prototyped (even static functions) and the formatting is consistent. Two new header files have been added, acopcode.h and acnames.h. Removed several obsolete functions that were no longer used. Signed-off-by: Len Brown <len.brown@intel.com>
2005-04-19 06:49:35 +04:00
* name
* ret_handle - Where the return handle is returned
*
* RETURN: Status
*
* DESCRIPTION: This routine will search for a caller specified name in the
* name space. The caller can restrict the search region by
* specifying a non NULL parent. The parent value is itself a
* namespace handle.
*
******************************************************************************/
acpi_status
acpi_get_handle(acpi_handle parent,
acpi_string pathname, acpi_handle *ret_handle)
{
acpi_status status;
struct acpi_namespace_node *node = NULL;
struct acpi_namespace_node *prefix_node = NULL;
ACPI_FUNCTION_ENTRY();
/* Parameter Validation */
if (!ret_handle || !pathname) {
return (AE_BAD_PARAMETER);
}
/* Convert a parent handle to a prefix node */
if (parent) {
prefix_node = acpi_ns_validate_handle(parent);
if (!prefix_node) {
return (AE_BAD_PARAMETER);
}
}
/*
* Valid cases are:
* 1) Fully qualified pathname
* 2) Parent + Relative pathname
*
* Error for <null Parent + relative path>
*/
if (ACPI_IS_ROOT_PREFIX(pathname[0])) {
/* Pathname is fully qualified (starts with '\') */
/* Special case for root-only, since we can't search for it */
if (!strcmp(pathname, ACPI_NS_ROOT_PATH)) {
*ret_handle =
ACPI_CAST_PTR(acpi_handle, acpi_gbl_root_node);
return (AE_OK);
}
} else if (!prefix_node) {
/* Relative path with null prefix is disallowed */
return (AE_BAD_PARAMETER);
}
/* Find the Node and convert to a handle */
status =
acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH, &node);
if (ACPI_SUCCESS(status)) {
*ret_handle = ACPI_CAST_PTR(acpi_handle, node);
}
return (status);
}
ACPI_EXPORT_SYMBOL(acpi_get_handle)
/******************************************************************************
*
* FUNCTION: acpi_get_name
*
* PARAMETERS: handle - Handle to be converted to a pathname
* name_type - Full pathname or single segment
* buffer - Buffer for returned path
*
* RETURN: Pointer to a string containing the fully qualified Name.
*
* DESCRIPTION: This routine returns the fully qualified name associated with
* the Handle parameter. This and the acpi_pathname_to_handle are
* complementary functions.
*
******************************************************************************/
acpi_status
acpi_get_name(acpi_handle handle, u32 name_type, struct acpi_buffer *buffer)
{
acpi_status status;
/* Parameter validation */
if (name_type > ACPI_NAME_TYPE_MAX) {
return (AE_BAD_PARAMETER);
}
status = acpi_ut_validate_buffer(buffer);
if (ACPI_FAILURE(status)) {
return (status);
}
/*
* Wants the single segment ACPI name.
* Validate handle and convert to a namespace Node
*/
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return (status);
}
if (name_type == ACPI_FULL_PATHNAME ||
name_type == ACPI_FULL_PATHNAME_NO_TRAILING) {
/* Get the full pathname (From the namespace root) */
status = acpi_ns_handle_to_pathname(handle, buffer,
name_type ==
ACPI_FULL_PATHNAME ? FALSE :
TRUE);
} else {
/* Get the single name */
status = acpi_ns_handle_to_name(handle, buffer);
}
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return (status);
}
ACPI_EXPORT_SYMBOL(acpi_get_name)
/******************************************************************************
*
* FUNCTION: acpi_ns_copy_device_id
*
* PARAMETERS: dest - Pointer to the destination PNP_DEVICE_ID
* source - Pointer to the source PNP_DEVICE_ID
* string_area - Pointer to where to copy the dest string
*
* RETURN: Pointer to the next string area
*
* DESCRIPTION: Copy a single PNP_DEVICE_ID, including the string data.
*
******************************************************************************/
static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
struct acpi_pnp_device_id *source,
char *string_area)
{
/* Create the destination PNP_DEVICE_ID */
dest->string = string_area;
dest->length = source->length;
/* Copy actual string and return a pointer to the next string area */
memcpy(string_area, source->string, source->length);
return (string_area + source->length);
}
/******************************************************************************
*
* FUNCTION: acpi_get_object_info
*
* PARAMETERS: handle - Object Handle
* return_buffer - Where the info is returned
*
* RETURN: Status
*
* DESCRIPTION: Returns information about an object as gleaned from the
* namespace node and possibly by running several standard
* control methods (Such as in the case of a device.)
*
* For Device and Processor objects, run the Device _HID, _UID, _CID,
* _CLS, _ADR, _sx_w, and _sx_d methods.
*
* Note: Allocates the return buffer, must be freed by the caller.
*
* Note: This interface is intended to be used during the initial device
* discovery namespace traversal. Therefore, no complex methods can be
* executed, especially those that access operation regions. Therefore, do
* not add any additional methods that could cause problems in this area.
* Because of this reason support for the following methods has been removed:
* 1) _SUB method was removed (11/2015)
* 2) _STA method was removed (02/2018)
*
******************************************************************************/
acpi_status
acpi_get_object_info(acpi_handle handle,
struct acpi_device_info **return_buffer)
{
struct acpi_namespace_node *node;
struct acpi_device_info *info;
struct acpi_pnp_device_id_list *cid_list = NULL;
struct acpi_pnp_device_id *hid = NULL;
struct acpi_pnp_device_id *uid = NULL;
struct acpi_pnp_device_id *cls = NULL;
char *next_id_string;
acpi_object_type type;
acpi_name name;
u8 param_count = 0;
u16 valid = 0;
u32 info_size;
u32 i;
acpi_status status;
/* Parameter validation */
if (!handle || !return_buffer) {
return (AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return (status);
}
node = acpi_ns_validate_handle(handle);
if (!node) {
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return (AE_BAD_PARAMETER);
}
/* Get the namespace node data while the namespace is locked */
info_size = sizeof(struct acpi_device_info);
type = node->type;
name = node->name.integer;
if (node->type == ACPI_TYPE_METHOD) {
param_count = node->object->method.param_count;
}
status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return (status);
}
if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
/*
* Get extra info for ACPI Device/Processor objects only:
* Run the Device _HID, _UID, _CLS, and _CID methods.
*
* Note: none of these methods are required, so they may or may
* not be present for this device. The Info->Valid bitfield is used
* to indicate which methods were found and run successfully.
*/
/* Execute the Device._HID method */
status = acpi_ut_execute_HID(node, &hid);
if (ACPI_SUCCESS(status)) {
info_size += hid->length;
valid |= ACPI_VALID_HID;
}
/* Execute the Device._UID method */
status = acpi_ut_execute_UID(node, &uid);
if (ACPI_SUCCESS(status)) {
info_size += uid->length;
valid |= ACPI_VALID_UID;
}
/* Execute the Device._CID method */
status = acpi_ut_execute_CID(node, &cid_list);
if (ACPI_SUCCESS(status)) {
/* Add size of CID strings and CID pointer array */
info_size +=
(cid_list->list_size -
sizeof(struct acpi_pnp_device_id_list));
valid |= ACPI_VALID_CID;
}
/* Execute the Device._CLS method */
status = acpi_ut_execute_CLS(node, &cls);
if (ACPI_SUCCESS(status)) {
info_size += cls->length;
valid |= ACPI_VALID_CLS;
}
}
/*
* Now that we have the variable-length data, we can allocate the
* return buffer
*/
info = ACPI_ALLOCATE_ZEROED(info_size);
if (!info) {
status = AE_NO_MEMORY;
goto cleanup;
}
/* Get the fixed-length data */
if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
/*
* Get extra info for ACPI Device/Processor objects only:
* Run the _ADR and, sx_w, and _sx_d methods.
*
* Notes: none of these methods are required, so they may or may
* not be present for this device. The Info->Valid bitfield is used
* to indicate which methods were found and run successfully.
*/
/* Execute the Device._ADR method */
status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, node,
&info->address);
if (ACPI_SUCCESS(status)) {
valid |= ACPI_VALID_ADR;
}
/* Execute the Device._sx_w methods */
status = acpi_ut_execute_power_methods(node,
acpi_gbl_lowest_dstate_names,
ACPI_NUM_sx_w_METHODS,
info->lowest_dstates);
if (ACPI_SUCCESS(status)) {
valid |= ACPI_VALID_SXWS;
}
/* Execute the Device._sx_d methods */
status = acpi_ut_execute_power_methods(node,
acpi_gbl_highest_dstate_names,
ACPI_NUM_sx_d_METHODS,
info->highest_dstates);
if (ACPI_SUCCESS(status)) {
valid |= ACPI_VALID_SXDS;
}
}
/*
* Create a pointer to the string area of the return buffer.
* Point to the end of the base struct acpi_device_info structure.
*/
next_id_string = ACPI_CAST_PTR(char, info->compatible_id_list.ids);
if (cid_list) {
/* Point past the CID PNP_DEVICE_ID array */
next_id_string +=
((acpi_size)cid_list->count *
sizeof(struct acpi_pnp_device_id));
}
/*
* Copy the HID, UID, and CIDs to the return buffer. The variable-length
* strings are copied to the reserved area at the end of the buffer.
*
* For HID and CID, check if the ID is a PCI Root Bridge.
*/
if (hid) {
next_id_string = acpi_ns_copy_device_id(&info->hardware_id,
hid, next_id_string);
if (acpi_ut_is_pci_root_bridge(hid->string)) {
info->flags |= ACPI_PCI_ROOT_BRIDGE;
}
}
if (uid) {
next_id_string = acpi_ns_copy_device_id(&info->unique_id,
uid, next_id_string);
}
if (cid_list) {
info->compatible_id_list.count = cid_list->count;
info->compatible_id_list.list_size = cid_list->list_size;
/* Copy each CID */
for (i = 0; i < cid_list->count; i++) {
next_id_string =
acpi_ns_copy_device_id(&info->compatible_id_list.
ids[i], &cid_list->ids[i],
next_id_string);
if (acpi_ut_is_pci_root_bridge(cid_list->ids[i].string)) {
info->flags |= ACPI_PCI_ROOT_BRIDGE;
}
}
}
if (cls) {
next_id_string = acpi_ns_copy_device_id(&info->class_code,
cls, next_id_string);
}
/* Copy the fixed-length data */
info->info_size = info_size;
info->type = type;
info->name = name;
info->param_count = param_count;
info->valid = valid;
*return_buffer = info;
status = AE_OK;
cleanup:
if (hid) {
ACPI_FREE(hid);
}
if (uid) {
ACPI_FREE(uid);
}
if (cid_list) {
ACPI_FREE(cid_list);
}
if (cls) {
ACPI_FREE(cls);
}
return (status);
}
ACPI_EXPORT_SYMBOL(acpi_get_object_info)
/******************************************************************************
*
* FUNCTION: acpi_install_method
*
* PARAMETERS: buffer - An ACPI table containing one control method
*
* RETURN: Status
*
* DESCRIPTION: Install a control method into the namespace. If the method
* name already exists in the namespace, it is overwritten. The
* input buffer must contain a valid DSDT or SSDT containing a
* single control method.
*
******************************************************************************/
acpi_status acpi_install_method(u8 *buffer)
{
struct acpi_table_header *table =
ACPI_CAST_PTR(struct acpi_table_header, buffer);
u8 *aml_buffer;
u8 *aml_start;
char *path;
struct acpi_namespace_node *node;
union acpi_operand_object *method_obj;
struct acpi_parse_state parser_state;
u32 aml_length;
u16 opcode;
u8 method_flags;
acpi_status status;
/* Parameter validation */
if (!buffer) {
return (AE_BAD_PARAMETER);
}
/* Table must be a DSDT or SSDT */
if (!ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_DSDT) &&
!ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_SSDT)) {
return (AE_BAD_HEADER);
}
/* First AML opcode in the table must be a control method */
parser_state.aml = buffer + sizeof(struct acpi_table_header);
opcode = acpi_ps_peek_opcode(&parser_state);
if (opcode != AML_METHOD_OP) {
return (AE_BAD_PARAMETER);
}
/* Extract method information from the raw AML */
parser_state.aml += acpi_ps_get_opcode_size(opcode);
parser_state.pkg_end = acpi_ps_get_next_package_end(&parser_state);
path = acpi_ps_get_next_namestring(&parser_state);
method_flags = *parser_state.aml++;
aml_start = parser_state.aml;
aml_length = ACPI_PTR_DIFF(parser_state.pkg_end, aml_start);
/*
* Allocate resources up-front. We don't want to have to delete a new
* node from the namespace if we cannot allocate memory.
*/
aml_buffer = ACPI_ALLOCATE(aml_length);
if (!aml_buffer) {
return (AE_NO_MEMORY);
}
method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
if (!method_obj) {
ACPI_FREE(aml_buffer);
return (AE_NO_MEMORY);
}
/* Lock namespace for acpi_ns_lookup, we may be creating a new node */
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
goto error_exit;
}
/* The lookup either returns an existing node or creates a new one */
status =
acpi_ns_lookup(NULL, path, ACPI_TYPE_METHOD, ACPI_IMODE_LOAD_PASS1,
ACPI_NS_DONT_OPEN_SCOPE | ACPI_NS_ERROR_IF_FOUND,
NULL, &node);
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) { /* ns_lookup */
if (status != AE_ALREADY_EXISTS) {
goto error_exit;
}
/* Node existed previously, make sure it is a method node */
if (node->type != ACPI_TYPE_METHOD) {
status = AE_TYPE;
goto error_exit;
}
}
/* Copy the method AML to the local buffer */
memcpy(aml_buffer, aml_start, aml_length);
/* Initialize the method object with the new method's information */
method_obj->method.aml_start = aml_buffer;
method_obj->method.aml_length = aml_length;
method_obj->method.param_count = (u8)
(method_flags & AML_METHOD_ARG_COUNT);
if (method_flags & AML_METHOD_SERIALIZED) {
method_obj->method.info_flags = ACPI_METHOD_SERIALIZED;
method_obj->method.sync_level = (u8)
((method_flags & AML_METHOD_SYNC_LEVEL) >> 4);
}
/*
* Now that it is complete, we can attach the new method object to
* the method Node (detaches/deletes any existing object)
*/
status = acpi_ns_attach_object(node, method_obj, ACPI_TYPE_METHOD);
/*
* Flag indicates AML buffer is dynamic, must be deleted later.
* Must be set only after attach above.
*/
node->flags |= ANOBJ_ALLOCATED_BUFFER;
/* Remove local reference to the method object */
acpi_ut_remove_reference(method_obj);
return (status);
error_exit:
ACPI_FREE(aml_buffer);
ACPI_FREE(method_obj);
return (status);
}
ACPI_EXPORT_SYMBOL(acpi_install_method)