evregion.c
上传用户:jlfgdled
上传日期:2013-04-10
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文件大小:18k
- /******************************************************************************
- *
- * Module Name: evregion - ACPI Address_space (Op_region) handler dispatch
- * $Revision: 113 $
- *
- *****************************************************************************/
- /*
- * Copyright (C) 2000, 2001 R. Byron Moore
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include "acpi.h"
- #include "acevents.h"
- #include "acnamesp.h"
- #include "acinterp.h"
- #include "amlcode.h"
- #define _COMPONENT ACPI_EVENTS
- MODULE_NAME ("evregion")
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ev_install_default_address_space_handlers
- *
- * PARAMETERS:
- *
- * RETURN: Status
- *
- * DESCRIPTION: Installs the core subsystem address space handlers.
- *
- ******************************************************************************/
- acpi_status
- acpi_ev_install_default_address_space_handlers (
- void)
- {
- acpi_status status;
- FUNCTION_TRACE ("Ev_install_default_address_space_handlers");
- /*
- * All address spaces (PCI Config, EC, SMBus) are scope dependent
- * and registration must occur for a specific device. In the case
- * system memory and IO address spaces there is currently no device
- * associated with the address space. For these we use the root.
- * We install the default PCI config space handler at the root so
- * that this space is immediately available even though the we have
- * not enumerated all the PCI Root Buses yet. This is to conform
- * to the ACPI specification which states that the PCI config
- * space must be always available -- even though we are nowhere
- * near ready to find the PCI root buses at this point.
- *
- * NOTE: We ignore AE_EXIST because this means that a handler has
- * already been installed (via Acpi_install_address_space_handler)
- */
- status = acpi_install_address_space_handler (acpi_gbl_root_node,
- ACPI_ADR_SPACE_SYSTEM_MEMORY,
- ACPI_DEFAULT_HANDLER, NULL, NULL);
- if ((ACPI_FAILURE (status)) &&
- (status != AE_EXIST)) {
- return_ACPI_STATUS (status);
- }
- status = acpi_install_address_space_handler (acpi_gbl_root_node,
- ACPI_ADR_SPACE_SYSTEM_IO,
- ACPI_DEFAULT_HANDLER, NULL, NULL);
- if ((ACPI_FAILURE (status)) &&
- (status != AE_EXIST)) {
- return_ACPI_STATUS (status);
- }
- status = acpi_install_address_space_handler (acpi_gbl_root_node,
- ACPI_ADR_SPACE_PCI_CONFIG,
- ACPI_DEFAULT_HANDLER, NULL, NULL);
- if ((ACPI_FAILURE (status)) &&
- (status != AE_EXIST)) {
- return_ACPI_STATUS (status);
- }
- return_ACPI_STATUS (AE_OK);
- }
- /* TBD: [Restructure] Move elsewhere */
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ev_execute_reg_method
- *
- * PARAMETERS: Region_obj - Object structure
- * Function - On (1) or Off (0)
- *
- * RETURN: Status
- *
- * DESCRIPTION: Execute _REG method for a region
- *
- ******************************************************************************/
- static acpi_status
- acpi_ev_execute_reg_method (
- acpi_operand_object *region_obj,
- u32 function)
- {
- acpi_operand_object *params[3];
- acpi_status status;
- FUNCTION_TRACE ("Ev_execute_reg_method");
- if (region_obj->region.extra->extra.method_REG == NULL) {
- return_ACPI_STATUS (AE_OK);
- }
- /*
- * _REG method has two arguments
- * Arg0: Integer: Operation region space ID
- * Same value as Region_obj->Region.Space_id
- * Arg1: Integer: connection status
- * 1 for connecting the handler,
- * 0 for disconnecting the handler
- * Passed as a parameter
- */
- params[0] = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
- if (!params[0]) {
- return_ACPI_STATUS (AE_NO_MEMORY);
- }
- params[1] = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
- if (!params[1]) {
- status = AE_NO_MEMORY;
- goto cleanup;
- }
- /*
- * Set up the parameter objects
- */
- params[0]->integer.value = region_obj->region.space_id;
- params[1]->integer.value = function;
- params[2] = NULL;
- /*
- * Execute the method, no return value
- */
- DEBUG_EXEC(acpi_ut_display_init_pathname (region_obj->region.extra->extra.method_REG, " [Method]"));
- status = acpi_ns_evaluate_by_handle (region_obj->region.extra->extra.method_REG, params, NULL);
- acpi_ut_remove_reference (params[1]);
- cleanup:
- acpi_ut_remove_reference (params[0]);
- return_ACPI_STATUS (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ev_address_space_dispatch
- *
- * PARAMETERS: Region_obj - internal region object
- * Space_id - ID of the address space (0-255)
- * Function - Read or Write operation
- * Address - Where in the space to read or write
- * Bit_width - Field width in bits (8, 16, or 32)
- * Value - Pointer to in or out value
- *
- * RETURN: Status
- *
- * DESCRIPTION: Dispatch an address space or operation region access to
- * a previously installed handler.
- *
- ******************************************************************************/
- acpi_status
- acpi_ev_address_space_dispatch (
- acpi_operand_object *region_obj,
- u32 function,
- ACPI_PHYSICAL_ADDRESS address,
- u32 bit_width,
- u32 *value)
- {
- acpi_status status;
- acpi_adr_space_handler handler;
- acpi_adr_space_setup region_setup;
- acpi_operand_object *handler_desc;
- void *region_context = NULL;
- FUNCTION_TRACE ("Ev_address_space_dispatch");
- /*
- * Ensure that there is a handler associated with this region
- */
- handler_desc = region_obj->region.addr_handler;
- if (!handler_desc) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "no handler for region(%p) [%s]n",
- region_obj, acpi_ut_get_region_name (region_obj->region.space_id)));
- return_ACPI_STATUS(AE_NOT_EXIST);
- }
- /*
- * It may be the case that the region has never been initialized
- * Some types of regions require special init code
- */
- if (!(region_obj->region.flags & AOPOBJ_INITIALIZED)) {
- /*
- * This region has not been initialized yet, do it
- */
- region_setup = handler_desc->addr_handler.setup;
- if (!region_setup) {
- /*
- * Bad news, no init routine and not init'd
- */
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No init routine for region(%p) [%s]n",
- region_obj, acpi_ut_get_region_name (region_obj->region.space_id)));
- return_ACPI_STATUS (AE_UNKNOWN_STATUS);
- }
- /*
- * We must exit the interpreter because the region setup will potentially
- * execute control methods
- */
- acpi_ex_exit_interpreter ();
- status = region_setup (region_obj, ACPI_REGION_ACTIVATE,
- handler_desc->addr_handler.context, ®ion_context);
- /* Re-enter the interpreter */
- acpi_ex_enter_interpreter ();
- /*
- * Init routine may fail
- */
- if (ACPI_FAILURE (status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Region Init: %s [%s]n",
- acpi_format_exception (status),
- acpi_ut_get_region_name (region_obj->region.space_id)));
- return_ACPI_STATUS(status);
- }
- region_obj->region.flags |= AOPOBJ_INITIALIZED;
- /*
- * Save the returned context for use in all accesses to
- * this particular region.
- */
- region_obj->region.extra->extra.region_context = region_context;
- }
- /*
- * We have everything we need, begin the process
- */
- handler = handler_desc->addr_handler.handler;
- ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
- "Addrhandler %p (%p), Address %8.8X%8.8Xn",
- ®ion_obj->region.addr_handler->addr_handler, handler, HIDWORD(address),
- LODWORD(address)));
- if (!(handler_desc->addr_handler.flags & ADDR_HANDLER_DEFAULT_INSTALLED)) {
- /*
- * For handlers other than the default (supplied) handlers, we must
- * exit the interpreter because the handler *might* block -- we don't
- * know what it will do, so we can't hold the lock on the intepreter.
- */
- acpi_ex_exit_interpreter();
- }
- /*
- * Invoke the handler.
- */
- status = handler (function, address, bit_width, value,
- handler_desc->addr_handler.context,
- region_obj->region.extra->extra.region_context);
- if (ACPI_FAILURE (status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Region handler: %s [%s]n",
- acpi_format_exception (status),
- acpi_ut_get_region_name (region_obj->region.space_id)));
- }
- if (!(handler_desc->addr_handler.flags & ADDR_HANDLER_DEFAULT_INSTALLED)) {
- /*
- * We just returned from a non-default handler, we must re-enter the
- * interpreter
- */
- acpi_ex_enter_interpreter ();
- }
- return_ACPI_STATUS (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ev_disassociate_region_from_handler
- *
- * PARAMETERS: Region_obj - Region Object
- * Acpi_ns_is_locked - Namespace Region Already Locked?
- *
- * RETURN: None
- *
- * DESCRIPTION: Break the association between the handler and the region
- * this is a two way association.
- *
- ******************************************************************************/
- void
- acpi_ev_disassociate_region_from_handler(
- acpi_operand_object *region_obj,
- u8 acpi_ns_is_locked)
- {
- acpi_operand_object *handler_obj;
- acpi_operand_object *obj_desc;
- acpi_operand_object **last_obj_ptr;
- acpi_adr_space_setup region_setup;
- void *region_context;
- acpi_status status;
- FUNCTION_TRACE ("Ev_disassociate_region_from_handler");
- region_context = region_obj->region.extra->extra.region_context;
- /*
- * Get the address handler from the region object
- */
- handler_obj = region_obj->region.addr_handler;
- if (!handler_obj) {
- /*
- * This region has no handler, all done
- */
- return_VOID;
- }
- /*
- * Find this region in the handler's list
- */
- obj_desc = handler_obj->addr_handler.region_list;
- last_obj_ptr = &handler_obj->addr_handler.region_list;
- while (obj_desc) {
- /*
- * See if this is the one
- */
- if (obj_desc == region_obj) {
- ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
- "Removing Region %p from address handler %pn",
- region_obj, handler_obj));
- /*
- * This is it, remove it from the handler's list
- */
- *last_obj_ptr = obj_desc->region.next;
- obj_desc->region.next = NULL; /* Must clear field */
- if (acpi_ns_is_locked) {
- acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
- }
- /*
- * Now stop region accesses by executing the _REG method
- */
- acpi_ev_execute_reg_method (region_obj, 0);
- if (acpi_ns_is_locked) {
- acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
- }
- /*
- * Call the setup handler with the deactivate notification
- */
- region_setup = handler_obj->addr_handler.setup;
- status = region_setup (region_obj, ACPI_REGION_DEACTIVATE,
- handler_obj->addr_handler.context, ®ion_context);
- /*
- * Init routine may fail, Just ignore errors
- */
- if (ACPI_FAILURE (status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%s from region init, [%s]n",
- acpi_format_exception (status),
- acpi_ut_get_region_name (region_obj->region.space_id)));
- }
- region_obj->region.flags &= ~(AOPOBJ_INITIALIZED);
- /*
- * Remove handler reference in the region
- *
- * NOTE: this doesn't mean that the region goes away
- * The region is just inaccessible as indicated to
- * the _REG method
- *
- * If the region is on the handler's list
- * this better be the region's handler
- */
- region_obj->region.addr_handler = NULL;
- return_VOID;
- } /* found the right handler */
- /*
- * Move through the linked list of handlers
- */
- last_obj_ptr = &obj_desc->region.next;
- obj_desc = obj_desc->region.next;
- }
- /*
- * If we get here, the region was not in the handler's region list
- */
- ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
- "Cannot remove region %p from address handler %pn",
- region_obj, handler_obj));
- return_VOID;
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ev_associate_region_and_handler
- *
- * PARAMETERS: Handler_obj - Handler Object
- * Region_obj - Region Object
- * Acpi_ns_is_locked - Namespace Region Already Locked?
- *
- * RETURN: None
- *
- * DESCRIPTION: Create the association between the handler and the region
- * this is a two way association.
- *
- ******************************************************************************/
- acpi_status
- acpi_ev_associate_region_and_handler (
- acpi_operand_object *handler_obj,
- acpi_operand_object *region_obj,
- u8 acpi_ns_is_locked)
- {
- acpi_status status;
- FUNCTION_TRACE ("Ev_associate_region_and_handler");
- ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
- "Adding Region %p to address handler %p [%s]n",
- region_obj, handler_obj, acpi_ut_get_region_name (region_obj->region.space_id)));
- /*
- * Link this region to the front of the handler's list
- */
- region_obj->region.next = handler_obj->addr_handler.region_list;
- handler_obj->addr_handler.region_list = region_obj;
- /*
- * set the region's handler
- */
- region_obj->region.addr_handler = handler_obj;
- /*
- * Last thing, tell all users that this region is usable
- */
- if (acpi_ns_is_locked) {
- acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
- }
- status = acpi_ev_execute_reg_method (region_obj, 1);
- if (acpi_ns_is_locked) {
- acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
- }
- return_ACPI_STATUS (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ev_addr_handler_helper
- *
- * PARAMETERS: Handle - Node to be dumped
- * Level - Nesting level of the handle
- * Context - Passed into Acpi_ns_walk_namespace
- *
- * DESCRIPTION: This routine checks to see if the object is a Region if it
- * is then the address handler is installed in it.
- *
- * If the Object is a Device, and the device has a handler of
- * the same type then the search is terminated in that branch.
- *
- * This is because the existing handler is closer in proximity
- * to any more regions than the one we are trying to install.
- *
- ******************************************************************************/
- acpi_status
- acpi_ev_addr_handler_helper (
- acpi_handle obj_handle,
- u32 level,
- void *context,
- void **return_value)
- {
- acpi_operand_object *handler_obj;
- acpi_operand_object *tmp_obj;
- acpi_operand_object *obj_desc;
- acpi_namespace_node *node;
- acpi_status status;
- PROC_NAME ("Ev_addr_handler_helper");
- handler_obj = (acpi_operand_object *) context;
- /* Parameter validation */
- if (!handler_obj) {
- return (AE_OK);
- }
- /* Convert and validate the device handle */
- node = acpi_ns_map_handle_to_node (obj_handle);
- if (!node) {
- return (AE_BAD_PARAMETER);
- }
- /*
- * We only care about regions.and objects
- * that can have address handlers
- */
- if ((node->type != ACPI_TYPE_DEVICE) &&
- (node->type != ACPI_TYPE_REGION) &&
- (node != acpi_gbl_root_node)) {
- return (AE_OK);
- }
- /* Check for an existing internal object */
- obj_desc = acpi_ns_get_attached_object (node);
- if (!obj_desc) {
- /*
- * The object DNE, we don't care about it
- */
- return (AE_OK);
- }
- /*
- * Devices are handled different than regions
- */
- if (IS_THIS_OBJECT_TYPE (obj_desc, ACPI_TYPE_DEVICE)) {
- /*
- * See if this guy has any handlers
- */
- tmp_obj = obj_desc->device.addr_handler;
- while (tmp_obj) {
- /*
- * Now let's see if it's for the same address space.
- */
- if (tmp_obj->addr_handler.space_id == handler_obj->addr_handler.space_id) {
- /*
- * It's for the same address space
- */
- ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
- "Found handler for region [%s] in device %p(%p) handler %pn",
- acpi_ut_get_region_name (handler_obj->addr_handler.space_id),
- obj_desc, tmp_obj, handler_obj));
- /*
- * Since the object we found it on was a device, then it
- * means that someone has already installed a handler for
- * the branch of the namespace from this device on. Just
- * bail out telling the walk routine to not traverse this
- * branch. This preserves the scoping rule for handlers.
- */
- return (AE_CTRL_DEPTH);
- }
- /*
- * Move through the linked list of handlers
- */
- tmp_obj = tmp_obj->addr_handler.next;
- }
- /*
- * As long as the device didn't have a handler for this
- * space we don't care about it. We just ignore it and
- * proceed.
- */
- return (AE_OK);
- }
- /*
- * Only here if it was a region
- */
- if (obj_desc->region.space_id != handler_obj->addr_handler.space_id) {
- /*
- * This region is for a different address space
- * ignore it
- */
- return (AE_OK);
- }
- /*
- * Now we have a region and it is for the handler's address
- * space type.
- *
- * First disconnect region for any previous handler (if any)
- */
- acpi_ev_disassociate_region_from_handler (obj_desc, FALSE);
- /*
- * Then connect the region to the new handler
- */
- status = acpi_ev_associate_region_and_handler (handler_obj, obj_desc, FALSE);
- return (status);
- }