linux/drivers/acpi/acpica/exconfig.c
Rafael J. Wysocki 9874647ba1 ACPI / ACPICA: Do not execute _PRW methods during initialization
Currently, during initialization ACPICA walks the entire ACPI
namespace in search of any device objects with assciated _PRW
methods.  All of the _PRW methods found are executed in the process
to extract the GPE information returned by them, so that the GPEs in
question can be marked as "able to wakeup" (more precisely, the
ACPI_GPE_CAN_WAKE flag is set for them).  The only purpose of this
exercise is to avoid enabling the CAN_WAKE GPEs automatically, even
if there are _Lxx/_Exx methods associated with them.  However, it is
both costly and unnecessary, because the host OS has to execute the
_PRW methods anyway to check which devices can wake up the system
from sleep states.  Moreover, it then uses full information
returned by _PRW, including the GPE information, so it can take care
of disabling the GPEs if necessary.

Remove the code that walks the namespace and executes _PRW from
ACPICA and modify comments to reflect that change.  Make
acpi_bus_set_run_wake_flags() disable GPEs for wakeup devices
so that they don't cause spurious wakeup events to be signaled.
This not only reduces the complexity of the ACPICA initialization
code, but in some cases it should reduce the kernel boot time as
well.

Unfortunately, for this purpose we need a new ACPICA function,
acpi_gpe_can_wake(), to be called by the host OS in order to disable
the GPEs that can wake up the system and were previously enabled by
acpi_ev_initialize_gpe_block() or acpi_ev_update_gpes() (such a GPE
should be disabled only once, because the initialization code enables
it only once, but it may be pointed to by _PRW for multiple devices
and that's why the additional function is necessary).

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
2010-07-12 14:17:39 -04:00

628 lines
18 KiB
C

/******************************************************************************
*
* Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2010, 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.
*/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "actables.h"
#include "acdispat.h"
#include "acevents.h"
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME("exconfig")
/* Local prototypes */
static acpi_status
acpi_ex_add_table(u32 table_index,
struct acpi_namespace_node *parent_node,
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,
struct acpi_namespace_node *parent_node,
union acpi_operand_object **ddb_handle)
{
union acpi_operand_object *obj_desc;
acpi_status status;
acpi_owner_id owner_id;
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;
*ddb_handle = obj_desc;
/* Install the new table into the local data structures */
obj_desc->reference.value = table_index;
/* Add the table to the namespace */
status = acpi_ns_load_table(table_index, parent_node);
if (ACPI_FAILURE(status)) {
acpi_ut_remove_reference(obj_desc);
*ddb_handle = NULL;
return_ACPI_STATUS(status);
}
/* Execute any module-level code that was found in the table */
acpi_ex_exit_interpreter();
acpi_ns_exec_module_code_list();
acpi_ex_enter_interpreter();
/* Update GPEs for any new _Lxx/_Exx methods. Ignore errors */
status = acpi_tb_get_owner_id(table_index, &owner_id);
if (ACPI_SUCCESS(status)) {
acpi_ev_update_gpes(owner_id);
}
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;
struct acpi_table_header *table;
u32 table_index;
ACPI_FUNCTION_TRACE(ex_load_table_op);
/* Validate lengths for the signature_string, OEMIDString, OEMtable_iD */
if ((operand[0]->string.length > ACPI_NAME_SIZE) ||
(operand[1]->string.length > ACPI_OEM_ID_SIZE) ||
(operand[2]->string.length > ACPI_OEM_TABLE_ID_SIZE)) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Find the ACPI table in the RSDT/XSDT */
status = acpi_tb_find_table(operand[0]->string.pointer,
operand[1]->string.pointer,
operand[2]->string.pointer, &table_index);
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(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] != '\\') &&
(operand[4]->string.pointer[0] != '^')) {
/*
* 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(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 */
status = acpi_ex_add_table(table_index, parent_node, &ddb_handle);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* 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);
}
}
status = acpi_get_table_by_index(table_index, &table);
if (ACPI_SUCCESS(status)) {
ACPI_INFO((AE_INFO, "Dynamic OEM Table Load:"));
acpi_tb_print_table_header(0, table);
}
/* Invoke table handler if present */
if (acpi_gbl_table_handler) {
(void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
acpi_gbl_table_handler_context);
}
*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, 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;
struct acpi_table_desc table_desc;
u32 table_index;
acpi_status status;
u32 length;
ACPI_FUNCTION_TRACE(ex_load_op);
ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
/* 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 = ACPI_ALLOCATE(sizeof(struct acpi_table_header));
if (!table) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
status =
acpi_ex_region_read(obj_desc,
sizeof(struct acpi_table_header),
ACPI_CAST_PTR(u8, table));
length = table->length;
ACPI_FREE(table);
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_desc.pointer = ACPI_ALLOCATE(length);
if (!table_desc.pointer) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Read the entire table */
status = acpi_ex_region_read(obj_desc, length,
ACPI_CAST_PTR(u8,
table_desc.pointer));
if (ACPI_FAILURE(status)) {
ACPI_FREE(table_desc.pointer);
return_ACPI_STATUS(status);
}
table_desc.address = obj_desc->region.address;
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 =
ACPI_CAST_PTR(struct acpi_table_header,
obj_desc->buffer.pointer);
length = table->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_desc.pointer = ACPI_ALLOCATE(length);
if (!table_desc.pointer) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
ACPI_MEMCPY(table_desc.pointer, table, length);
table_desc.address = ACPI_TO_INTEGER(table_desc.pointer);
break;
default:
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
}
/* Validate table checksum (will not get validated in tb_add_table) */
status = acpi_tb_verify_checksum(table_desc.pointer, length);
if (ACPI_FAILURE(status)) {
ACPI_FREE(table_desc.pointer);
return_ACPI_STATUS(status);
}
/* Complete the table descriptor */
table_desc.length = length;
table_desc.flags = ACPI_TABLE_ORIGIN_ALLOCATED;
/* Install the new table into the local data structures */
status = acpi_tb_add_table(&table_desc, &table_index);
if (ACPI_FAILURE(status)) {
/* Delete allocated table buffer */
acpi_tb_delete_table(&table_desc);
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, acpi_gbl_root_node, &ddb_handle);
if (ACPI_FAILURE(status)) {
/* On error, table_ptr was deallocated above */
return_ACPI_STATUS(status);
}
/* 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);
}
ACPI_INFO((AE_INFO, "Dynamic OEM Table Load:"));
acpi_tb_print_table_header(0, table_desc.pointer);
/* Remove the reference by added by acpi_ex_store above */
acpi_ut_remove_reference(ddb_handle);
/* Invoke table handler if present */
if (acpi_gbl_table_handler) {
(void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD,
table_desc.pointer,
acpi_gbl_table_handler_context);
}
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;
struct acpi_table_header *table;
ACPI_FUNCTION_TRACE(ex_unload_table);
/*
* 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_BAD_PARAMETER);
}
/* Get the table index from the ddb_handle */
table_index = table_desc->reference.value;
/* Ensure the table is still loaded */
if (!acpi_tb_is_table_loaded(table_index)) {
return_ACPI_STATUS(AE_NOT_EXIST);
}
/* Invoke table handler if present */
if (acpi_gbl_table_handler) {
status = acpi_get_table_by_index(table_index, &table);
if (ACPI_SUCCESS(status)) {
(void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
table,
acpi_gbl_table_handler_context);
}
}
/* Delete the portion of the namespace owned by this table */
status = acpi_tb_delete_namespace_by_owner(table_index);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
(void)acpi_tb_release_owner_id(table_index);
acpi_tb_set_table_loaded_flag(table_index, FALSE);
/*
* 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.
*/
ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID;
return_ACPI_STATUS(AE_OK);
}