--- /dev/null
+/******************************************************************************
+ *
+ * Module Name: nsxfname - Public interfaces to the ACPI subsystem
+ * ACPI Namespace oriented interfaces
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2015, Intel Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ * substantially similar to the "NO WARRANTY" disclaimer below
+ * ("Disclaimer") and any redistribution must be conditioned upon
+ * including a substantially similar Disclaimer requirement for further
+ * binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ * of any contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+#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
+ * 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 (!ACPI_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;
+ struct acpi_namespace_node *node;
+ char *node_name;
+
+ /* 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);
+ }
+
+ if (name_type == ACPI_FULL_PATHNAME) {
+
+ /* Get the full pathname (From the namespace root) */
+
+ status = acpi_ns_handle_to_pathname(handle, buffer);
+ 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);
+ }
+
+ node = acpi_ns_validate_handle(handle);
+ if (!node) {
+ status = AE_BAD_PARAMETER;
+ goto unlock_and_exit;
+ }
+
+ /* Validate/Allocate/Clear caller buffer */
+
+ status = acpi_ut_initialize_buffer(buffer, ACPI_PATH_SEGMENT_LENGTH);
+ if (ACPI_FAILURE(status)) {
+ goto unlock_and_exit;
+ }
+
+ /* Just copy the ACPI name from the Node and zero terminate it */
+
+ node_name = acpi_ut_get_node_name(node);
+ ACPI_MOVE_NAME(buffer->pointer, node_name);
+ ((char *)buffer->pointer)[ACPI_NAME_SIZE] = 0;
+ status = AE_OK;
+
+unlock_and_exit:
+
+ (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 */
+
+ ACPI_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, _SUB,
+ * _STA, _ADR, _sx_w, and _sx_d methods.
+ *
+ * Note: Allocates the return buffer, must be freed by the caller.
+ *
+ ******************************************************************************/
+
+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 *sub = NULL;
+ char *next_id_string;
+ acpi_object_type type;
+ acpi_name name;
+ u8 param_count = 0;
+ u8 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, _SUB, 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._SUB method */
+
+ status = acpi_ut_execute_SUB(node, &sub);
+ if (ACPI_SUCCESS(status)) {
+ info_size += sub->length;
+ valid |= ACPI_VALID_SUB;
+ }
+
+ /* 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;
+ }
+ }
+
+ /*
+ * 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 _STA, _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.
+ *
+ * For _STA, if the method does not exist, then (as per the ACPI
+ * specification), the returned current_status flags will indicate
+ * that the device is present/functional/enabled. Otherwise, the
+ * current_status flags reflect the value returned from _STA.
+ */
+
+ /* Execute the Device._STA method */
+
+ status = acpi_ut_execute_STA(node, &info->current_status);
+ if (ACPI_SUCCESS(status)) {
+ valid |= ACPI_VALID_STA;
+ }
+
+ /* 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, SUB, 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 (sub) {
+ next_id_string = acpi_ns_copy_device_id(&info->subsystem_id,
+ sub, 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;
+ }
+ }
+ }
+
+ /* 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 (sub) {
+ ACPI_FREE(sub);
+ }
+ if (cid_list) {
+ ACPI_FREE(cid_list);
+ }
+ 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_NAME(table->signature, ACPI_SIG_DSDT) &&
+ !ACPI_COMPARE_NAME(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 */
+
+ ACPI_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)
Code Review / kvmfornfv.git / blobdiff