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linux/drivers/acpi/events/evregion.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

1068 lines
30 KiB
C
Raw Blame History

/******************************************************************************
*
* Module Name: evregion - ACPI address_space (op_region) handler dispatch
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2005, 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/acevents.h>
#include <acpi/acnamesp.h>
#include <acpi/acinterp.h>
#define _COMPONENT ACPI_EVENTS
ACPI_MODULE_NAME ("evregion")
#define ACPI_NUM_DEFAULT_SPACES 4
static u8 acpi_gbl_default_address_spaces[ACPI_NUM_DEFAULT_SPACES] = {
ACPI_ADR_SPACE_SYSTEM_MEMORY,
ACPI_ADR_SPACE_SYSTEM_IO,
ACPI_ADR_SPACE_PCI_CONFIG,
ACPI_ADR_SPACE_DATA_TABLE};
/*******************************************************************************
*
* FUNCTION: acpi_ev_install_region_handlers
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Installs the core subsystem default address space handlers.
*
******************************************************************************/
acpi_status
acpi_ev_install_region_handlers (
void) {
acpi_status status;
acpi_native_uint i;
ACPI_FUNCTION_TRACE ("ev_install_region_handlers");
status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/*
* All address spaces (PCI Config, EC, SMBus) are scope dependent
* and registration must occur for a specific device.
*
* In the case of the 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_ALREADY_EXISTS because this means that a handler
* has already been installed (via acpi_install_address_space_handler).
* Similar for AE_SAME_HANDLER.
*/
for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
status = acpi_ev_install_space_handler (acpi_gbl_root_node,
acpi_gbl_default_address_spaces[i],
ACPI_DEFAULT_HANDLER, NULL, NULL);
switch (status) {
case AE_OK:
case AE_SAME_HANDLER:
case AE_ALREADY_EXISTS:
/* These exceptions are all OK */
status = AE_OK;
break;
default:
goto unlock_and_exit;
}
}
unlock_and_exit:
(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_initialize_op_regions
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Execute _REG methods for all Operation Regions that have
* an installed default region handler.
*
******************************************************************************/
acpi_status
acpi_ev_initialize_op_regions (
void)
{
acpi_status status;
acpi_native_uint i;
ACPI_FUNCTION_TRACE ("ev_initialize_op_regions");
status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/*
* Run the _REG methods for op_regions in each default address space
*/
for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
/* TBD: Make sure handler is the DEFAULT handler, otherwise
* _REG will have already been run.
*/
status = acpi_ev_execute_reg_methods (acpi_gbl_root_node,
acpi_gbl_default_address_spaces[i]);
}
(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_execute_reg_method
*
* PARAMETERS: region_obj - Object structure
* Function - Passed to _REG: On (1) or Off (0)
*
* RETURN: Status
*
* DESCRIPTION: Execute _REG method for a region
*
******************************************************************************/
acpi_status
acpi_ev_execute_reg_method (
union acpi_operand_object *region_obj,
u32 function)
{
struct acpi_parameter_info info;
union acpi_operand_object *params[3];
union acpi_operand_object *region_obj2;
acpi_status status;
ACPI_FUNCTION_TRACE ("ev_execute_reg_method");
region_obj2 = acpi_ns_get_secondary_object (region_obj);
if (!region_obj2) {
return_ACPI_STATUS (AE_NOT_EXIST);
}
if (region_obj2->extra.method_REG == NULL) {
return_ACPI_STATUS (AE_OK);
}
/*
* The _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;
}
/* Setup the parameter objects */
params[0]->integer.value = region_obj->region.space_id;
params[1]->integer.value = function;
params[2] = NULL;
info.node = region_obj2->extra.method_REG;
info.parameters = params;
info.parameter_type = ACPI_PARAM_ARGS;
/* Execute the method, no return value */
ACPI_DEBUG_EXEC (acpi_ut_display_init_pathname (
ACPI_TYPE_METHOD, info.node, NULL));
status = acpi_ns_evaluate_by_handle (&info);
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
* Function - Read or Write operation
* Address - Where in the space to read or write
* bit_width - Field width in bits (8, 16, 32, or 64)
* 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 (
union acpi_operand_object *region_obj,
u32 function,
acpi_physical_address address,
u32 bit_width,
void *value)
{
acpi_status status;
acpi_status status2;
acpi_adr_space_handler handler;
acpi_adr_space_setup region_setup;
union acpi_operand_object *handler_desc;
union acpi_operand_object *region_obj2;
void *region_context = NULL;
ACPI_FUNCTION_TRACE ("ev_address_space_dispatch");
region_obj2 = acpi_ns_get_secondary_object (region_obj);
if (!region_obj2) {
return_ACPI_STATUS (AE_NOT_EXIST);
}
/* Ensure that there is a handler associated with this region */
handler_desc = region_obj->region.handler;
if (!handler_desc) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"No handler for Region [%4.4s] (%p) [%s]\n",
acpi_ut_get_node_name (region_obj->region.node),
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_SETUP_COMPLETE)) {
/*
* This region has not been initialized yet, do it
*/
region_setup = handler_desc->address_space.setup;
if (!region_setup) {
/* No initialization routine, exit with error */
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_NOT_EXIST);
}
/*
* We must exit the interpreter because the region setup will potentially
* execute control methods (e.g., _REG method for this region)
*/
acpi_ex_exit_interpreter ();
status = region_setup (region_obj, ACPI_REGION_ACTIVATE,
handler_desc->address_space.context, &region_context);
/* Re-enter the interpreter */
status2 = acpi_ex_enter_interpreter ();
if (ACPI_FAILURE (status2)) {
return_ACPI_STATUS (status2);
}
/* Check for failure of the Region Setup */
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 initialization may have been completed by region_setup
*/
if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE;
if (region_obj2->extra.region_context) {
/* The handler for this region was already installed */
ACPI_MEM_FREE (region_context);
}
else {
/*
* Save the returned context for use in all accesses to
* this particular region
*/
region_obj2->extra.region_context = region_context;
}
}
}
/* We have everything we need, we can invoke the address space handler */
handler = handler_desc->address_space.handler;
ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
"Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
&region_obj->region.handler->address_space, handler,
ACPI_FORMAT_UINT64 (address),
acpi_ut_get_region_name (region_obj->region.space_id)));
if (!(handler_desc->address_space.hflags & ACPI_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();
}
/* Call the handler */
status = handler (function, address, bit_width, value,
handler_desc->address_space.context,
region_obj2->extra.region_context);
if (ACPI_FAILURE (status)) {
ACPI_REPORT_ERROR (("Handler for [%s] returned %s\n",
acpi_ut_get_region_name (region_obj->region.space_id),
acpi_format_exception (status)));
}
if (!(handler_desc->address_space.hflags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
/*
* We just returned from a non-default handler, we must re-enter the
* interpreter
*/
status2 = acpi_ex_enter_interpreter ();
if (ACPI_FAILURE (status2)) {
return_ACPI_STATUS (status2);
}
}
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_detach_region
*
* 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_detach_region(
union acpi_operand_object *region_obj,
u8 acpi_ns_is_locked)
{
union acpi_operand_object *handler_obj;
union acpi_operand_object *obj_desc;
union acpi_operand_object **last_obj_ptr;
acpi_adr_space_setup region_setup;
void **region_context;
union acpi_operand_object *region_obj2;
acpi_status status;
ACPI_FUNCTION_TRACE ("ev_detach_region");
region_obj2 = acpi_ns_get_secondary_object (region_obj);
if (!region_obj2) {
return_VOID;
}
region_context = &region_obj2->extra.region_context;
/* Get the address handler from the region object */
handler_obj = region_obj->region.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->address_space.region_list;
last_obj_ptr = &handler_obj->address_space.region_list;
while (obj_desc) {
/* Is this the correct Region? */
if (obj_desc == region_obj) {
ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
"Removing Region %p from address handler %p\n",
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) {
status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
return_VOID;
}
}
/* Now stop region accesses by executing the _REG method */
status = acpi_ev_execute_reg_method (region_obj, 0);
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%s from region _REG, [%s]\n",
acpi_format_exception (status),
acpi_ut_get_region_name (region_obj->region.space_id)));
}
if (acpi_ns_is_locked) {
status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE (status)) {
return_VOID;
}
}
/* Call the setup handler with the deactivate notification */
region_setup = handler_obj->address_space.setup;
status = region_setup (region_obj, ACPI_REGION_DEACTIVATE,
handler_obj->address_space.context, region_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_SETUP_COMPLETE);
/*
* 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.handler = NULL;
acpi_ut_remove_reference (handler_obj);
return_VOID;
}
/* Walk 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 %p\n",
region_obj, handler_obj));
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_attach_region
*
* 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_attach_region (
union acpi_operand_object *handler_obj,
union acpi_operand_object *region_obj,
u8 acpi_ns_is_locked)
{
ACPI_FUNCTION_TRACE ("ev_attach_region");
ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
"Adding Region [%4.4s] %p to address handler %p [%s]\n",
acpi_ut_get_node_name (region_obj->region.node),
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->address_space.region_list;
handler_obj->address_space.region_list = region_obj;
/* Install the region's handler */
if (region_obj->region.handler) {
return_ACPI_STATUS (AE_ALREADY_EXISTS);
}
region_obj->region.handler = handler_obj;
acpi_ut_add_reference (handler_obj);
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_install_handler
*
* PARAMETERS: walk_namespace callback
*
* DESCRIPTION: This routine installs an address handler into objects that are
* of type Region or Device.
*
* 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_install_handler (
acpi_handle obj_handle,
u32 level,
void *context,
void **return_value)
{
union acpi_operand_object *handler_obj;
union acpi_operand_object *next_handler_obj;
union acpi_operand_object *obj_desc;
struct acpi_namespace_node *node;
acpi_status status;
ACPI_FUNCTION_NAME ("ev_install_handler");
handler_obj = (union 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 are allowed to have address space 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) {
/* No object, just exit */
return (AE_OK);
}
/* Devices are handled different than regions */
if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_DEVICE) {
/* Check if this Device already has a handler for this address space */
next_handler_obj = obj_desc->device.handler;
while (next_handler_obj) {
/* Found a handler, is it for the same address space? */
if (next_handler_obj->address_space.space_id == handler_obj->address_space.space_id) {
ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
"Found handler for region [%s] in device %p(%p) handler %p\n",
acpi_ut_get_region_name (handler_obj->address_space.space_id),
obj_desc, next_handler_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);
}
/* Walk the linked list of handlers attached to this device */
next_handler_obj = next_handler_obj->address_space.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);
}
/* Object is a Region */
if (obj_desc->region.space_id != handler_obj->address_space.space_id) {
/*
* This region is for a different address space
* -- just 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_detach_region (obj_desc, FALSE);
/* Connect the region to the new handler */
status = acpi_ev_attach_region (handler_obj, obj_desc, FALSE);
return (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_install_space_handler
*
* PARAMETERS: Node - Namespace node 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.
* Assumes namespace is locked
*
******************************************************************************/
acpi_status
acpi_ev_install_space_handler (
struct acpi_namespace_node *node,
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;
acpi_status status;
acpi_object_type type;
u16 flags = 0;
ACPI_FUNCTION_TRACE ("ev_install_space_handler");
/*
* 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, node, ACPI_UINT32_MAX,
ACPI_NS_WALK_UNLOCK, acpi_ev_install_handler,
handler_obj, NULL);
unlock_and_exit:
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_execute_reg_methods
*
* PARAMETERS: Node - Namespace node for the device
* space_id - The address space ID
*
* RETURN: Status
*
* DESCRIPTION: Run all _REG methods for the input Space ID;
* Note: assumes namespace is locked, or system init time.
*
******************************************************************************/
acpi_status
acpi_ev_execute_reg_methods (
struct acpi_namespace_node *node,
acpi_adr_space_type space_id)
{
acpi_status status;
ACPI_FUNCTION_TRACE ("ev_execute_reg_methods");
/*
* Run all _REG methods for all Operation 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, node, ACPI_UINT32_MAX,
ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run,
&space_id, NULL);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_reg_run
*
* PARAMETERS: walk_namespace callback
*
* DESCRIPTION: Run _REg method for region objects of the requested space_iD
*
******************************************************************************/
acpi_status
acpi_ev_reg_run (
acpi_handle obj_handle,
u32 level,
void *context,
void **return_value)
{
union acpi_operand_object *obj_desc;
struct acpi_namespace_node *node;
acpi_adr_space_type space_id;
acpi_status status;
space_id = *ACPI_CAST_PTR (acpi_adr_space_type, context);
/* 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 are allowed to have address space handlers
*/
if ((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) {
/* No object, just exit */
return (AE_OK);
}
/* Object is a Region */
if (obj_desc->region.space_id != space_id) {
/*
* This region is for a different address space
* -- just ignore it
*/
return (AE_OK);
}
status = acpi_ev_execute_reg_method (obj_desc, 1);
return (status);
}
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