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linux-zen-server/drivers/acpi/acpica/exconfig.c

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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
*
* Copyright (C) 2000 - 2022, Intel Corp.
*
*****************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "actables.h"
#include "acdispat.h"
#include "acevents.h"
#include "amlcode.h"
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME("exconfig")
/* Local prototypes */
static acpi_status
acpi_ex_add_table(u32 table_index, union acpi_operand_object **ddb_handle);
static acpi_status
acpi_ex_region_read(union acpi_operand_object *obj_desc,
u32 length, u8 *buffer);
/*******************************************************************************
*
* FUNCTION: acpi_ex_add_table
*
* PARAMETERS: table - Pointer to raw table
* parent_node - Where to load the table (scope)
* ddb_handle - Where to return the table handle.
*
* RETURN: Status
*
* DESCRIPTION: Common function to Install and Load an ACPI table with a
* returned table handle.
*
******************************************************************************/
static acpi_status
acpi_ex_add_table(u32 table_index, union acpi_operand_object **ddb_handle)
{
union acpi_operand_object *obj_desc;
ACPI_FUNCTION_TRACE(ex_add_table);
/* Create an object to be the table handle */
obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
if (!obj_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Init the table handle */
obj_desc->common.flags |= AOPOBJ_DATA_VALID;
obj_desc->reference.class = ACPI_REFCLASS_TABLE;
obj_desc->reference.value = table_index;
*ddb_handle = obj_desc;
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_load_table_op
*
* PARAMETERS: walk_state - Current state with operands
* return_desc - Where to store the return object
*
* RETURN: Status
*
* DESCRIPTION: Load an ACPI table from the RSDT/XSDT
*
******************************************************************************/
acpi_status
acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
union acpi_operand_object **return_desc)
{
acpi_status status;
union acpi_operand_object **operand = &walk_state->operands[0];
struct acpi_namespace_node *parent_node;
struct acpi_namespace_node *start_node;
struct acpi_namespace_node *parameter_node = NULL;
union acpi_operand_object *return_obj;
union acpi_operand_object *ddb_handle;
u32 table_index;
ACPI_FUNCTION_TRACE(ex_load_table_op);
/* Create the return object */
return_obj = acpi_ut_create_integer_object((u64)0);
if (!return_obj) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
*return_desc = return_obj;
/* Find the ACPI table in the RSDT/XSDT */
acpi_ex_exit_interpreter();
status = acpi_tb_find_table(operand[0]->string.pointer,
operand[1]->string.pointer,
operand[2]->string.pointer, &table_index);
acpi_ex_enter_interpreter();
if (ACPI_FAILURE(status)) {
if (status != AE_NOT_FOUND) {
return_ACPI_STATUS(status);
}
/* Table not found, return an Integer=0 and AE_OK */
return_ACPI_STATUS(AE_OK);
}
/* Default nodes */
start_node = walk_state->scope_info->scope.node;
parent_node = acpi_gbl_root_node;
/* root_path (optional parameter) */
if (operand[3]->string.length > 0) {
/*
* Find the node referenced by the root_path_string. This is the
* location within the namespace where the table will be loaded.
*/
status = acpi_ns_get_node_unlocked(start_node,
operand[3]->string.pointer,
ACPI_NS_SEARCH_PARENT,
&parent_node);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
/* parameter_path (optional parameter) */
if (operand[4]->string.length > 0) {
if ((operand[4]->string.pointer[0] != AML_ROOT_PREFIX) &&
(operand[4]->string.pointer[0] != AML_PARENT_PREFIX)) {
/*
* Path is not absolute, so it will be relative to the node
* referenced by the root_path_string (or the NS root if omitted)
*/
start_node = parent_node;
}
/* Find the node referenced by the parameter_path_string */
status = acpi_ns_get_node_unlocked(start_node,
operand[4]->string.pointer,
ACPI_NS_SEARCH_PARENT,
&parameter_node);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
/* Load the table into the namespace */
ACPI_INFO(("Dynamic OEM Table Load:"));
acpi_ex_exit_interpreter();
status = acpi_tb_load_table(table_index, parent_node);
acpi_ex_enter_interpreter();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
status = acpi_ex_add_table(table_index, &ddb_handle);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Complete the initialization/resolution of new objects */
acpi_ex_exit_interpreter();
acpi_ns_initialize_objects();
acpi_ex_enter_interpreter();
/* Parameter Data (optional) */
if (parameter_node) {
/* Store the parameter data into the optional parameter object */
status = acpi_ex_store(operand[5],
ACPI_CAST_PTR(union acpi_operand_object,
parameter_node),
walk_state);
if (ACPI_FAILURE(status)) {
(void)acpi_ex_unload_table(ddb_handle);
acpi_ut_remove_reference(ddb_handle);
return_ACPI_STATUS(status);
}
}
/* Remove the reference to ddb_handle created by acpi_ex_add_table above */
acpi_ut_remove_reference(ddb_handle);
/* Return -1 (non-zero) indicates success */
return_obj->integer.value = 0xFFFFFFFFFFFFFFFF;
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_region_read
*
* PARAMETERS: obj_desc - Region descriptor
* length - Number of bytes to read
* buffer - Pointer to where to put the data
*
* RETURN: Status
*
* DESCRIPTION: Read data from an operation region. The read starts from the
* beginning of the region.
*
******************************************************************************/
static acpi_status
acpi_ex_region_read(union acpi_operand_object *obj_desc, u32 length, u8 *buffer)
{
acpi_status status;
u64 value;
u32 region_offset = 0;
u32 i;
/* Bytewise reads */
for (i = 0; i < length; i++) {
status =
acpi_ev_address_space_dispatch(obj_desc, NULL, ACPI_READ,
region_offset, 8, &value);
if (ACPI_FAILURE(status)) {
return (status);
}
*buffer = (u8)value;
buffer++;
region_offset++;
}
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_load_op
*
* PARAMETERS: obj_desc - Region or Buffer/Field where the table will be
* obtained
* target - Where the status of the load will be stored
* walk_state - Current state
*
* RETURN: Status
*
* DESCRIPTION: Load an ACPI table from a field or operation region
*
* NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
* objects before this code is reached.
*
* If source is an operation region, it must refer to system_memory, as
* per the ACPI specification.
*
******************************************************************************/
acpi_status
acpi_ex_load_op(union acpi_operand_object *obj_desc,
union acpi_operand_object *target,
struct acpi_walk_state *walk_state)
{
union acpi_operand_object *ddb_handle;
struct acpi_table_header *table_header;
struct acpi_table_header *table;
u32 table_index;
acpi_status status;
u32 length;
ACPI_FUNCTION_TRACE(ex_load_op);
if (target->common.descriptor_type == ACPI_DESC_TYPE_NAMED) {
target =
acpi_ns_get_attached_object(ACPI_CAST_PTR
(struct acpi_namespace_node,
target));
}
if (target->common.type != ACPI_TYPE_INTEGER) {
ACPI_ERROR((AE_INFO, "Type not integer: %X",
target->common.type));
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
}
target->integer.value = 0;
/* Source Object can be either an op_region or a Buffer/Field */
switch (obj_desc->common.type) {
case ACPI_TYPE_REGION:
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Load table from Region %p\n", obj_desc));
/* Region must be system_memory (from ACPI spec) */
if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
}
/*
* If the Region Address and Length have not been previously
* evaluated, evaluate them now and save the results.
*/
if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
status = acpi_ds_get_region_arguments(obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
/* Get the table header first so we can get the table length */
table_header = ACPI_ALLOCATE(sizeof(struct acpi_table_header));
if (!table_header) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
status =
acpi_ex_region_read(obj_desc,
sizeof(struct acpi_table_header),
ACPI_CAST_PTR(u8, table_header));
length = table_header->length;
ACPI_FREE(table_header);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Must have at least an ACPI table header */
if (length < sizeof(struct acpi_table_header)) {
return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
}
/*
* The original implementation simply mapped the table, with no copy.
* However, the memory region is not guaranteed to remain stable and
* we must copy the table to a local buffer. For example, the memory
* region is corrupted after suspend on some machines. Dynamically
* loaded tables are usually small, so this overhead is minimal.
*
* The latest implementation (5/2009) does not use a mapping at all.
* We use the low-level operation region interface to read the table
* instead of the obvious optimization of using a direct mapping.
* This maintains a consistent use of operation regions across the
* entire subsystem. This is important if additional processing must
* be performed in the (possibly user-installed) operation region
* handler. For example, acpi_exec and ASLTS depend on this.
*/
/* Allocate a buffer for the table */
table = ACPI_ALLOCATE(length);
if (!table) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Read the entire table */
status = acpi_ex_region_read(obj_desc, length,
ACPI_CAST_PTR(u8, table));
if (ACPI_FAILURE(status)) {
ACPI_FREE(table);
return_ACPI_STATUS(status);
}
break;
case ACPI_TYPE_BUFFER: /* Buffer or resolved region_field */
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Load table from Buffer or Field %p\n",
obj_desc));
/* Must have at least an ACPI table header */
if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) {
return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
}
/* Get the actual table length from the table header */
table_header =
ACPI_CAST_PTR(struct acpi_table_header,
obj_desc->buffer.pointer);
length = table_header->length;
/* Table cannot extend beyond the buffer */
if (length > obj_desc->buffer.length) {
return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
}
if (length < sizeof(struct acpi_table_header)) {
return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
}
/*
* Copy the table from the buffer because the buffer could be
* modified or even deleted in the future
*/
table = ACPI_ALLOCATE(length);
if (!table) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
memcpy(table, table_header, length);
break;
default:
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
}
/* Install the new table into the local data structures */
ACPI_INFO(("Dynamic OEM Table Load:"));
acpi_ex_exit_interpreter();
status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table),
ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
table, TRUE, &table_index);
acpi_ex_enter_interpreter();
if (ACPI_FAILURE(status)) {
/* Delete allocated table buffer */
ACPI_FREE(table);
return_ACPI_STATUS(status);
}
/*
* Add the table to the namespace.
*
* Note: Load the table objects relative to the root of the namespace.
* This appears to go against the ACPI specification, but we do it for
* compatibility with other ACPI implementations.
*/
status = acpi_ex_add_table(table_index, &ddb_handle);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Complete the initialization/resolution of new objects */
acpi_ex_exit_interpreter();
acpi_ns_initialize_objects();
acpi_ex_enter_interpreter();
/* Remove the reference to ddb_handle created by acpi_ex_add_table above */
acpi_ut_remove_reference(ddb_handle);
/* Return -1 (non-zero) indicates success */
target->integer.value = 0xFFFFFFFFFFFFFFFF;
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_unload_table
*
* PARAMETERS: ddb_handle - Handle to a previously loaded table
*
* RETURN: Status
*
* DESCRIPTION: Unload an ACPI table
*
******************************************************************************/
acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
{
acpi_status status = AE_OK;
union acpi_operand_object *table_desc = ddb_handle;
u32 table_index;
ACPI_FUNCTION_TRACE(ex_unload_table);
/*
* Temporarily emit a warning so that the ASL for the machine can be
* hopefully obtained. This is to say that the Unload() operator is
* extremely rare if not completely unused.
*/
ACPI_WARNING((AE_INFO, "Received request to unload an ACPI table"));
/*
* May 2018: Unload is no longer supported for the following reasons:
* 1) A correct implementation on some hosts may not be possible.
* 2) Other ACPI implementations do not correctly/fully support it.
* 3) It requires host device driver support which does not exist.
* (To properly support namespace unload out from underneath.)
* 4) This AML operator has never been seen in the field.
*/
ACPI_EXCEPTION((AE_INFO, AE_NOT_IMPLEMENTED,
"AML Unload operator is not supported"));
/*
* Validate the handle
* Although the handle is partially validated in acpi_ex_reconfiguration()
* when it calls acpi_ex_resolve_operands(), the handle is more completely
* validated here.
*
* Handle must be a valid operand object of type reference. Also, the
* ddb_handle must still be marked valid (table has not been previously
* unloaded)
*/
if ((!ddb_handle) ||
(ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
(ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) ||
(!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) {
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
}
/* Get the table index from the ddb_handle */
table_index = table_desc->reference.value;
/*
* Release the interpreter lock so that the table lock won't have
* strict order requirement against it.
*/
acpi_ex_exit_interpreter();
status = acpi_tb_unload_table(table_index);
acpi_ex_enter_interpreter();
/*
* Invalidate the handle. We do this because the handle may be stored
* in a named object and may not be actually deleted until much later.
*/
if (ACPI_SUCCESS(status)) {
ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID;
}
return_ACPI_STATUS(status);
}
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