diff options
Diffstat (limited to 'drivers/acpi/events/evregion.c')
| -rw-r--r-- | drivers/acpi/events/evregion.c | 1067 |
1 files changed, 1067 insertions, 0 deletions
diff --git a/drivers/acpi/events/evregion.c b/drivers/acpi/events/evregion.c new file mode 100644 index 00000000000..772342708a7 --- /dev/null +++ b/drivers/acpi/events/evregion.c @@ -0,0 +1,1067 @@ +/****************************************************************************** + * + * 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, ®ion_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", + ®ion_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 = ®ion_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); +} + |