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Diffstat (limited to 'drivers/acpi/acpica/exconfig.c')
| -rw-r--r-- | drivers/acpi/acpica/exconfig.c | 538 |
1 files changed, 538 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/exconfig.c b/drivers/acpi/acpica/exconfig.c new file mode 100644 index 000000000..68efd704e --- /dev/null +++ b/drivers/acpi/acpica/exconfig.c @@ -0,0 +1,538 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes) + * + * Copyright (C) 2000 - 2020, 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 *ddb_handle; + u32 table_index; + + ACPI_FUNCTION_TRACE(ex_load_table_op); + + /* 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 */ + + ddb_handle = acpi_ut_create_integer_object((u64) 0); + if (!ddb_handle) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + + *return_desc = ddb_handle; + 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, + ¶meter_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); + } + } + + *return_desc = ddb_handle; + 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 a handle to the table 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); + + /* 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, + 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)) { + + /* On error, table_ptr was deallocated above */ + + return_ACPI_STATUS(status); + } + + /* Complete the initialization/resolution of new objects */ + + acpi_ex_exit_interpreter(); + acpi_ns_initialize_objects(); + acpi_ex_enter_interpreter(); + + /* Store the ddb_handle into the Target operand */ + + status = acpi_ex_store(ddb_handle, target, walk_state); + if (ACPI_FAILURE(status)) { + (void)acpi_ex_unload_table(ddb_handle); + + /* table_ptr was deallocated above */ + + acpi_ut_remove_reference(ddb_handle); + return_ACPI_STATUS(status); + } + + /* Remove the reference by added by acpi_ex_store above */ + + acpi_ut_remove_reference(ddb_handle); + 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); +} |