/****************************************************************************** * * Module Name: evregion - ACPI address_space (op_region) handler dispatch * *****************************************************************************/ /* * Copyright (C) 2000 - 2012, 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 "acevents.h" #include "acnamesp.h" #include "acinterp.h" #define _COMPONENT ACPI_EVENTS ACPI_MODULE_NAME("evregion") /* Local prototypes */ static u8 acpi_ev_has_default_handler(struct acpi_namespace_node *node, acpi_adr_space_type space_id); static void acpi_ev_orphan_ec_reg_method(void); static acpi_status acpi_ev_reg_run(acpi_handle obj_handle, u32 level, void *context, void **return_value); static acpi_status acpi_ev_install_handler(acpi_handle obj_handle, u32 level, void *context, void **return_value); /* These are the address spaces that will get default handlers */ #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; u32 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_has_default_handler * * PARAMETERS: node - Namespace node for the device * space_id - The address space ID * * RETURN: TRUE if default handler is installed, FALSE otherwise * * DESCRIPTION: Check if the default handler is installed for the requested * space ID. * ******************************************************************************/ static u8 acpi_ev_has_default_handler(struct acpi_namespace_node *node, acpi_adr_space_type space_id) { union acpi_operand_object *obj_desc; union acpi_operand_object *handler_obj; /* Must have an existing internal object */ obj_desc = acpi_ns_get_attached_object(node); if (obj_desc) { handler_obj = obj_desc->device.handler; /* Walk the linked list of handlers for this object */ while (handler_obj) { if (handler_obj->address_space.space_id == space_id) { if (handler_obj->address_space.handler_flags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) { return (TRUE); } } handler_obj = handler_obj->address_space.next; } } return (FALSE); } /******************************************************************************* * * 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; u32 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++) { /* * Make sure the installed handler is the DEFAULT handler. If not the * default, the _REG methods will have already been run (when the * handler was installed) */ if (acpi_ev_has_default_handler(acpi_gbl_root_node, acpi_gbl_default_address_spaces [i])) { status = acpi_ev_execute_reg_methods(acpi_gbl_root_node, acpi_gbl_default_address_spaces [i]); } } acpi_gbl_reg_methods_executed = TRUE; (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ev_execute_reg_method * * PARAMETERS: region_obj - Region object * 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_evaluate_info *info; union acpi_operand_object *args[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); } /* Allocate and initialize the evaluation information block */ info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); if (!info) { return_ACPI_STATUS(AE_NO_MEMORY); } info->prefix_node = region_obj2->extra.method_REG; info->pathname = NULL; info->parameters = args; info->flags = ACPI_IGNORE_RETURN_VALUE; /* * 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) */ args[0] = acpi_ut_create_integer_object((u64) region_obj->region.space_id); if (!args[0]) { status = AE_NO_MEMORY; goto cleanup1; } args[1] = acpi_ut_create_integer_object((u64) function); if (!args[1]) { status = AE_NO_MEMORY; goto cleanup2; } args[2] = NULL; /* Terminate list */ /* Execute the method, no return value */ ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname (ACPI_TYPE_METHOD, info->prefix_node, NULL)); status = acpi_ns_evaluate(info); acpi_ut_remove_reference(args[1]); cleanup2: acpi_ut_remove_reference(args[0]); cleanup1: ACPI_FREE(info); return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ev_address_space_dispatch * * PARAMETERS: region_obj - Internal region object * field_obj - Corresponding field. Can be NULL. * function - Read or Write operation * region_offset - Where in the region to read or write * bit_width - Field width in bits (8, 16, 32, or 64) * value - Pointer to in or out value, must be * a full 64-bit integer * * 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, union acpi_operand_object *field_obj, u32 function, u32 region_offset, u32 bit_width, u64 *value) { acpi_status status; 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; struct acpi_connection_info *context; 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_ERROR((AE_INFO, "No handler for Region [%4.4s] (%p) [%s]", 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); } context = handler_desc->address_space.context; /* * 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_ERROR((AE_INFO, "No init routine for region(%p) [%s]", 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 (for example, the _REG method * for this region) */ acpi_ex_exit_interpreter(); status = region_setup(region_obj, ACPI_REGION_ACTIVATE, context, ®ion_context); /* Re-enter the interpreter */ acpi_ex_enter_interpreter(); /* Check for failure of the Region Setup */ if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "During region initialization: [%s]", 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_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_NATIVE_UINT(region_obj->region.address + region_offset), acpi_ut_get_region_name(region_obj->region. space_id))); /* * Special handling for generic_serial_bus and general_purpose_io: * There are three extra parameters that must be passed to the * handler via the context: * 1) Connection buffer, a resource template from Connection() op. * 2) Length of the above buffer. * 3) Actual access length from the access_as() op. */ if (((region_obj->region.space_id == ACPI_ADR_SPACE_GSBUS) || (region_obj->region.space_id == ACPI_ADR_SPACE_GPIO)) && context && field_obj) { /* Get the Connection (resource_template) buffer */ context->connection = field_obj->field.resource_buffer; context->length = field_obj->field.resource_length; context->access_length = field_obj->field.access_length; } if (!(handler_desc->address_space.handler_flags & 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, (region_obj->region.address + region_offset), bit_width, value, context, region_obj2->extra.region_context); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]", acpi_ut_get_region_name(region_obj->region. space_id))); } if (!(handler_desc->address_space.handler_flags & ACPI_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_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, ACPI_REG_DISCONNECT); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "from region _REG, [%s]", 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; } } /* * If the region has been activated, call the setup handler with * the deactivate notification */ if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) { 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_EXCEPTION((AE_INFO, status, "from region handler - deactivate, [%s]", 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 must 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. * ******************************************************************************/ static 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_validate_handle(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 (obj_desc->common.type == 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; u8 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 the * 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.handler_flags = 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, NULL, 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, NULL, &space_id, NULL); /* Special case for EC: handle "orphan" _REG methods with no region */ if (space_id == ACPI_ADR_SPACE_EC) { acpi_ev_orphan_ec_reg_method(); } return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ev_reg_run * * PARAMETERS: walk_namespace callback * * DESCRIPTION: Run _REG method for region objects of the requested spaceID * ******************************************************************************/ static 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_validate_handle(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, ACPI_REG_CONNECT); return (status); } /******************************************************************************* * * FUNCTION: acpi_ev_orphan_ec_reg_method * * PARAMETERS: None * * RETURN: None * * DESCRIPTION: Execute an "orphan" _REG method that appears under the EC * device. This is a _REG method that has no corresponding region * within the EC device scope. The orphan _REG method appears to * have been enabled by the description of the ECDT in the ACPI * specification: "The availability of the region space can be * detected by providing a _REG method object underneath the * Embedded Controller device." * * To quickly access the EC device, we use the EC_ID that appears * within the ECDT. Otherwise, we would need to perform a time- * consuming namespace walk, executing _HID methods to find the * EC device. * ******************************************************************************/ static void acpi_ev_orphan_ec_reg_method(void) { struct acpi_table_ecdt *table; acpi_status status; struct acpi_object_list args; union acpi_object objects[2]; struct acpi_namespace_node *ec_device_node; struct acpi_namespace_node *reg_method; struct acpi_namespace_node *next_node; ACPI_FUNCTION_TRACE(ev_orphan_ec_reg_method); /* Get the ECDT (if present in system) */ status = acpi_get_table(ACPI_SIG_ECDT, 0, ACPI_CAST_INDIRECT_PTR(struct acpi_table_header, &table)); if (ACPI_FAILURE(status)) { return_VOID; } /* We need a valid EC_ID string */ if (!(*table->id)) { return_VOID; } /* Namespace is currently locked, must release */ (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); /* Get a handle to the EC device referenced in the ECDT */ status = acpi_get_handle(NULL, ACPI_CAST_PTR(char, table->id), ACPI_CAST_PTR(acpi_handle, &ec_device_node)); if (ACPI_FAILURE(status)) { goto exit; } /* Get a handle to a _REG method immediately under the EC device */ status = acpi_get_handle(ec_device_node, METHOD_NAME__REG, ACPI_CAST_PTR(acpi_handle, ®_method)); if (ACPI_FAILURE(status)) { goto exit; } /* * Execute the _REG method only if there is no Operation Region in * this scope with the Embedded Controller space ID. Otherwise, it * will already have been executed. Note, this allows for Regions * with other space IDs to be present; but the code below will then * execute the _REG method with the EC space ID argument. */ next_node = acpi_ns_get_next_node(ec_device_node, NULL); while (next_node) { if ((next_node->type == ACPI_TYPE_REGION) && (next_node->object) && (next_node->object->region.space_id == ACPI_ADR_SPACE_EC)) { goto exit; /* Do not execute _REG */ } next_node = acpi_ns_get_next_node(ec_device_node, next_node); } /* Evaluate the _REG(EC,Connect) method */ args.count = 2; args.pointer = objects; objects[0].type = ACPI_TYPE_INTEGER; objects[0].integer.value = ACPI_ADR_SPACE_EC; objects[1].type = ACPI_TYPE_INTEGER; objects[1].integer.value = ACPI_REG_CONNECT; status = acpi_evaluate_object(reg_method, NULL, &args, NULL); exit: /* We ignore all errors from above, don't care */ status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); return_VOID; }