/******************************************************************************
*
* Module Name: evxfregn - External Interfaces, ACPI Operation Regions and
* Address Spaces.
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2004, R. Byron Moore
* 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 <acpi/acnamesp.h>
#include <acpi/acevents.h>
#include <acpi/acinterp.h>
#define _COMPONENT ACPI_EVENTS
ACPI_MODULE_NAME ("evxfregn")
/*******************************************************************************
*
* FUNCTION: acpi_install_address_space_handler
*
* PARAMETERS: Device - Handle for the device
* space_id - The address space ID
* Handler - Address of the handler
* Setup - Address of the setup function
* Context - Value passed to the handler on each access
*
* RETURN: Status
*
* DESCRIPTION: Install a handler for all op_regions of a given space_id.
*
******************************************************************************/
acpi_status
acpi_install_address_space_handler (
acpi_handle device,
acpi_adr_space_type space_id,
acpi_adr_space_handler handler,
acpi_adr_space_setup setup,
void *context)
{
union acpi_operand_object *obj_desc;
union acpi_operand_object *handler_obj;
struct acpi_namespace_node *node;
acpi_status status;
acpi_object_type type;
u16 flags = 0;
ACPI_FUNCTION_TRACE ("acpi_install_address_space_handler");
/* Parameter validation */
if (!device) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/* Convert and validate the device handle */
node = acpi_ns_map_handle_to_node (device);
if (!node) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
/*
* This registration is valid for only the types below
* and the root. This is where the default handlers
* get placed.
*/
if ((node->type != ACPI_TYPE_DEVICE) &&
(node->type != ACPI_TYPE_PROCESSOR) &&
(node->type != ACPI_TYPE_THERMAL) &&
(node != acpi_gbl_root_node)) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
if (handler == ACPI_DEFAULT_HANDLER) {
flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;
switch (space_id) {
case ACPI_ADR_SPACE_SYSTEM_MEMORY:
handler = acpi_ex_system_memory_space_handler;
setup = acpi_ev_system_memory_region_setup;
break;
case ACPI_ADR_SPACE_SYSTEM_IO:
handler = acpi_ex_system_io_space_handler;
setup = acpi_ev_io_space_region_setup;
break;
case ACPI_ADR_SPACE_PCI_CONFIG:
handler = acpi_ex_pci_config_space_handler;
setup = acpi_ev_pci_config_region_setup;
break;
case ACPI_ADR_SPACE_CMOS:
handler = acpi_ex_cmos_space_handler;
setup = acpi_ev_cmos_region_setup;
break;
case ACPI_ADR_SPACE_PCI_BAR_TARGET:
handler = acpi_ex_pci_bar_space_handler;
setup = acpi_ev_pci_bar_region_setup;
break;
case ACPI_ADR_SPACE_DATA_TABLE:
handler = acpi_ex_data_table_space_handler;
setup = NULL;
break;
default:
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
}
/* If the caller hasn't specified a setup routine, use the default */
if (!setup) {
setup = acpi_ev_default_region_setup;
}
/* Check for an existing internal object */
obj_desc = acpi_ns_get_attached_object (node);
if (obj_desc) {
/*
* The attached device object already exists.
* Make sure the handler is not already installed.
*/
handler_obj = obj_desc->device.handler;
/* Walk the handler list for this device */
while (handler_obj) {
/* Same space_id indicates a handler already installed */
if(handler_obj->address_space.space_id == space_id) {
if (handler_obj->address_space.handler == handler) {
/*
* It is (relatively) OK to attempt to install the SAME
* handler twice. This can easily happen with PCI_Config space.
*/
status = AE_SAME_HANDLER;
goto unlock_and_exit;
}
else {
/* A handler is already installed */
status = AE_ALREADY_EXISTS;
}
goto unlock_and_exit;
}
/* Walk the linked list of handlers */
handler_obj = handler_obj->address_space.next;
}
}
else {
ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
"Creating object on Device %p while installing handler\n", node));
/* obj_desc does not exist, create one */
if (node->type == ACPI_TYPE_ANY) {
type = ACPI_TYPE_DEVICE;
}
else {
type = node->type;
}
obj_desc = acpi_ut_create_internal_object (type);
if (!obj_desc) {
status = AE_NO_MEMORY;
goto unlock_and_exit;
}
/* Init new descriptor */
obj_desc->common.type = (u8) type;
/* Attach the new object to the Node */
status = acpi_ns_attach_object (node, obj_desc, type);
/* Remove local reference to the object */
acpi_ut_remove_reference (obj_desc);
if (ACPI_FAILURE (status)) {
goto unlock_and_exit;
}
}
ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
"Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",
acpi_ut_get_region_name (space_id), space_id,
acpi_ut_get_node_name (node), node, obj_desc));
/*
* Install the handler
*
* At this point there is no existing handler.
* Just allocate the object for the handler and link it
* into the list.
*/
handler_obj = acpi_ut_create_internal_object (ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
if (!handler_obj) {
status = AE_NO_MEMORY;
goto unlock_and_exit;
}
/* Init handler obj */
handler_obj->address_space.space_id = (u8) space_id;
handler_obj->address_space.hflags = flags;
handler_obj->address_space.region_list = NULL;
handler_obj->address_space.node = node;
handler_obj->address_space.handler = handler;
handler_obj->address_space.context = context;
handler_obj->address_space.setup = setup;
/* Install at head of Device.address_space list */
handler_obj->address_space.next = obj_desc->device.handler;
/*
* The Device object is the first reference on the handler_obj.
* Each region that uses the handler adds a reference.
*/
obj_desc->device.handler = handler_obj;
/*
* Walk the namespace finding all of the regions this
* handler will manage.
*
* Start at the device and search the branch toward
* the leaf nodes until either the leaf is encountered or
* a device is detected that has an address handler of the
* same type.
*
* In either case, back up and search down the remainder
* of the branch
*/
status = acpi_ns_walk_namespace (ACPI_TYPE_ANY, device, ACPI_UINT32_MAX,
ACPI_NS_WALK_UNLOCK, acpi_ev_install_handler,
handler_obj, NULL);
/*
* Now we can run the _REG methods for all Regions for this
* space ID. This is a separate walk in order to handle any
* interdependencies between regions and _REG methods. (i.e. handlers
* must be installed for all regions of this Space ID before we
* can run any _REG methods.
*/
status = acpi_ns_walk_namespace (ACPI_TYPE_ANY, device, ACPI_UINT32_MAX,
ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run,
handler_obj, NULL);
unlock_and_exit:
(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_remove_address_space_handler
*
* PARAMETERS: Device - Handle for the device
* space_id - The address space ID
* Handler - Address of the handler
*
* RETURN: Status
*
* DESCRIPTION: Remove a previously installed handler.
*
******************************************************************************/
acpi_status
acpi_remove_address_space_handler (
acpi_handle device,
acpi_adr_space_type space_id,
acpi_adr_space_handler handler)
{
union acpi_operand_object *obj_desc;
union acpi_operand_object *handler_obj;
union acpi_operand_object *region_obj;
union acpi_operand_object **last_obj_ptr;
struct acpi_namespace_node *node;
acpi_status status;
ACPI_FUNCTION_TRACE ("acpi_remove_address_space_handler");
/* Parameter validation */
if (!device) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/* Convert and validate the device handle */
node = acpi_ns_map_handle_to_node (device);
if (!node) {
status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
/* Make sure the internal object exists */
obj_desc = acpi_ns_get_attached_object (node);
if (!obj_desc) {
status = AE_NOT_EXIST;
goto unlock_and_exit;
}
/* Find the address handler the user requested */
handler_obj = obj_desc->device.handler;
last_obj_ptr = &obj_desc->device.handler;
while (handler_obj) {
/* We have a handler, see if user requested this one */
if (handler_obj->address_space.space_id == space_id) {
/* Matched space_id, first dereference this in the Regions */
ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
"Removing address handler %p(%p) for region %s on Device %p(%p)\n",
handler_obj, handler, acpi_ut_get_region_name (space_id),
node, obj_desc));
region_obj = handler_obj->address_space.region_list;
/* Walk the handler's region list */
while (region_obj) {
/*
* First disassociate the handler from the region.
*
* NOTE: this doesn't mean that the region goes away
* The region is just inaccessible as indicated to
* the _REG method
*/
acpi_ev_detach_region (region_obj, TRUE);
/*
* Walk the list: Just grab the head because the
* detach_region removed the previous head.
*/
region_obj = handler_obj->address_space.region_list;
}
/* Remove this Handler object from the list */
*last_obj_ptr = handler_obj->address_space.next;
/* Now we can delete the handler object */
acpi_ut_remove_reference (handler_obj);
goto unlock_and_exit;
}
/* Walk the linked list of handlers */
last_obj_ptr = &handler_obj->address_space.next;
handler_obj = handler_obj->address_space.next;
}
/* The handler does not exist */
ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
"Unable to remove address handler %p for %s(%X), dev_node %p, obj %p\n",
handler, acpi_ut_get_region_name (space_id), space_id, node, obj_desc));
status = AE_NOT_EXIST;
unlock_and_exit:
(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
return_ACPI_STATUS (status);
}
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