/****************************************************************************** * * Module Name: nsinit - namespace initialization * *****************************************************************************/ /* * 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 "acnamesp.h" #include "acdispat.h" #include "acinterp.h" #include <linux/nmi.h> #define _COMPONENT ACPI_NAMESPACE ACPI_MODULE_NAME("nsinit") /* Local prototypes */ static acpi_status acpi_ns_init_one_object(acpi_handle obj_handle, u32 level, void *context, void **return_value); static acpi_status acpi_ns_init_one_device(acpi_handle obj_handle, u32 nesting_level, void *context, void **return_value); static acpi_status acpi_ns_find_ini_methods(acpi_handle obj_handle, u32 nesting_level, void *context, void **return_value); /******************************************************************************* * * FUNCTION: acpi_ns_initialize_objects * * PARAMETERS: None * * RETURN: Status * * DESCRIPTION: Walk the entire namespace and perform any necessary * initialization on the objects found therein * ******************************************************************************/ acpi_status acpi_ns_initialize_objects(void) { acpi_status status; struct acpi_init_walk_info info; ACPI_FUNCTION_TRACE(ns_initialize_objects); ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "**** Starting initialization of namespace objects ****\n")); ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "Completing Region/Field/Buffer/Package initialization:")); /* Set all init info to zero */ ACPI_MEMSET(&info, 0, sizeof(struct acpi_init_walk_info)); /* Walk entire namespace from the supplied root */ status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, acpi_ns_init_one_object, NULL, &info, NULL); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace")); } ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "\nInitialized %u/%u Regions %u/%u Fields %u/%u " "Buffers %u/%u Packages (%u nodes)\n", info.op_region_init, info.op_region_count, info.field_init, info.field_count, info.buffer_init, info.buffer_count, info.package_init, info.package_count, info.object_count)); ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "%u Control Methods found\n", info.method_count)); ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "%u Op Regions found\n", info.op_region_count)); return_ACPI_STATUS(AE_OK); } /******************************************************************************* * * FUNCTION: acpi_ns_initialize_devices * * PARAMETERS: None * * RETURN: acpi_status * * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices. * This means running _INI on all present devices. * * Note: We install PCI config space handler on region access, * not here. * ******************************************************************************/ acpi_status acpi_ns_initialize_devices(void) { acpi_status status; struct acpi_device_walk_info info; ACPI_FUNCTION_TRACE(ns_initialize_devices); /* Init counters */ info.device_count = 0; info.num_STA = 0; info.num_INI = 0; ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "Initializing Device/Processor/Thermal objects " "by executing _INI methods:")); /* Tree analysis: find all subtrees that contain _INI methods */ status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, FALSE, acpi_ns_find_ini_methods, NULL, &info, NULL); if (ACPI_FAILURE(status)) { goto error_exit; } /* Allocate the evaluation information block */ info.evaluate_info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); if (!info.evaluate_info) { status = AE_NO_MEMORY; goto error_exit; } /* * Execute the "global" _INI method that may appear at the root. This * support is provided for Windows compatibility (Vista+) and is not * part of the ACPI specification. */ info.evaluate_info->prefix_node = acpi_gbl_root_node; info.evaluate_info->pathname = METHOD_NAME__INI; info.evaluate_info->parameters = NULL; info.evaluate_info->flags = ACPI_IGNORE_RETURN_VALUE; status = acpi_ns_evaluate(info.evaluate_info); if (ACPI_SUCCESS(status)) { info.num_INI++; } /* Walk namespace to execute all _INIs on present devices */ status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, FALSE, acpi_ns_init_one_device, NULL, &info, NULL); /* * Any _OSI requests should be completed by now. If the BIOS has * requested any Windows OSI strings, we will always truncate * I/O addresses to 16 bits -- for Windows compatibility. */ if (acpi_gbl_osi_data >= ACPI_OSI_WIN_2000) { acpi_gbl_truncate_io_addresses = TRUE; } ACPI_FREE(info.evaluate_info); if (ACPI_FAILURE(status)) { goto error_exit; } ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "\nExecuted %u _INI methods requiring %u _STA executions " "(examined %u objects)\n", info.num_INI, info.num_STA, info.device_count)); return_ACPI_STATUS(status); error_exit: ACPI_EXCEPTION((AE_INFO, status, "During device initialization")); return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ns_init_one_object * * PARAMETERS: obj_handle - Node * Level - Current nesting level * Context - Points to a init info struct * return_value - Not used * * RETURN: Status * * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object * within the namespace. * * Currently, the only objects that require initialization are: * 1) Methods * 2) Op Regions * ******************************************************************************/ static acpi_status acpi_ns_init_one_object(acpi_handle obj_handle, u32 level, void *context, void **return_value) { acpi_object_type type; acpi_status status = AE_OK; struct acpi_init_walk_info *info = (struct acpi_init_walk_info *)context; struct acpi_namespace_node *node = (struct acpi_namespace_node *)obj_handle; union acpi_operand_object *obj_desc; ACPI_FUNCTION_NAME(ns_init_one_object); info->object_count++; /* And even then, we are only interested in a few object types */ type = acpi_ns_get_type(obj_handle); obj_desc = acpi_ns_get_attached_object(node); if (!obj_desc) { return (AE_OK); } /* Increment counters for object types we are looking for */ switch (type) { case ACPI_TYPE_REGION: info->op_region_count++; break; case ACPI_TYPE_BUFFER_FIELD: info->field_count++; break; case ACPI_TYPE_LOCAL_BANK_FIELD: info->field_count++; break; case ACPI_TYPE_BUFFER: info->buffer_count++; break; case ACPI_TYPE_PACKAGE: info->package_count++; break; default: /* No init required, just exit now */ return (AE_OK); } /* If the object is already initialized, nothing else to do */ if (obj_desc->common.flags & AOPOBJ_DATA_VALID) { return (AE_OK); } /* Must lock the interpreter before executing AML code */ acpi_ex_enter_interpreter(); /* * Each of these types can contain executable AML code within the * declaration. */ switch (type) { case ACPI_TYPE_REGION: info->op_region_init++; status = acpi_ds_get_region_arguments(obj_desc); break; case ACPI_TYPE_BUFFER_FIELD: info->field_init++; status = acpi_ds_get_buffer_field_arguments(obj_desc); break; case ACPI_TYPE_LOCAL_BANK_FIELD: info->field_init++; status = acpi_ds_get_bank_field_arguments(obj_desc); break; case ACPI_TYPE_BUFFER: info->buffer_init++; status = acpi_ds_get_buffer_arguments(obj_desc); break; case ACPI_TYPE_PACKAGE: info->package_init++; status = acpi_ds_get_package_arguments(obj_desc); break; default: /* No other types can get here */ break; } if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "Could not execute arguments for [%4.4s] (%s)", acpi_ut_get_node_name(node), acpi_ut_get_type_name(type))); } /* * Print a dot for each object unless we are going to print the entire * pathname */ if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) { ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, ".")); } /* * We ignore errors from above, and always return OK, since we don't want * to abort the walk on any single error. */ acpi_ex_exit_interpreter(); return (AE_OK); } /******************************************************************************* * * FUNCTION: acpi_ns_find_ini_methods * * PARAMETERS: acpi_walk_callback * * RETURN: acpi_status * * DESCRIPTION: Called during namespace walk. Finds objects named _INI under * device/processor/thermal objects, and marks the entire subtree * with a SUBTREE_HAS_INI flag. This flag is used during the * subsequent device initialization walk to avoid entire subtrees * that do not contain an _INI. * ******************************************************************************/ static acpi_status acpi_ns_find_ini_methods(acpi_handle obj_handle, u32 nesting_level, void *context, void **return_value) { struct acpi_device_walk_info *info = ACPI_CAST_PTR(struct acpi_device_walk_info, context); struct acpi_namespace_node *node; struct acpi_namespace_node *parent_node; /* Keep count of device/processor/thermal objects */ node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle); if ((node->type == ACPI_TYPE_DEVICE) || (node->type == ACPI_TYPE_PROCESSOR) || (node->type == ACPI_TYPE_THERMAL)) { info->device_count++; return (AE_OK); } /* We are only looking for methods named _INI */ if (!ACPI_COMPARE_NAME(node->name.ascii, METHOD_NAME__INI)) { return (AE_OK); } /* * The only _INI methods that we care about are those that are * present under Device, Processor, and Thermal objects. */ parent_node = node->parent; switch (parent_node->type) { case ACPI_TYPE_DEVICE: case ACPI_TYPE_PROCESSOR: case ACPI_TYPE_THERMAL: /* Mark parent and bubble up the INI present flag to the root */ while (parent_node) { parent_node->flags |= ANOBJ_SUBTREE_HAS_INI; parent_node = parent_node->parent; } break; default: break; } return (AE_OK); } /******************************************************************************* * * FUNCTION: acpi_ns_init_one_device * * PARAMETERS: acpi_walk_callback * * RETURN: acpi_status * * DESCRIPTION: This is called once per device soon after ACPI is enabled * to initialize each device. It determines if the device is * present, and if so, calls _INI. * ******************************************************************************/ static acpi_status acpi_ns_init_one_device(acpi_handle obj_handle, u32 nesting_level, void *context, void **return_value) { struct acpi_device_walk_info *walk_info = ACPI_CAST_PTR(struct acpi_device_walk_info, context); struct acpi_evaluate_info *info = walk_info->evaluate_info; u32 flags; acpi_status status; struct acpi_namespace_node *device_node; ACPI_FUNCTION_TRACE(ns_init_one_device); /* We are interested in Devices, Processors and thermal_zones only */ device_node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle); if ((device_node->type != ACPI_TYPE_DEVICE) && (device_node->type != ACPI_TYPE_PROCESSOR) && (device_node->type != ACPI_TYPE_THERMAL)) { return_ACPI_STATUS(AE_OK); } /* * Because of an earlier namespace analysis, all subtrees that contain an * _INI method are tagged. * * If this device subtree does not contain any _INI methods, we * can exit now and stop traversing this entire subtree. */ if (!(device_node->flags & ANOBJ_SUBTREE_HAS_INI)) { return_ACPI_STATUS(AE_CTRL_DEPTH); } /* * Run _STA to determine if this device is present and functioning. We * must know this information for two important reasons (from ACPI spec): * * 1) We can only run _INI if the device is present. * 2) We must abort the device tree walk on this subtree if the device is * not present and is not functional (we will not examine the children) * * The _STA method is not required to be present under the device, we * assume the device is present if _STA does not exist. */ ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname (ACPI_TYPE_METHOD, device_node, METHOD_NAME__STA)); status = acpi_ut_execute_STA(device_node, &flags); if (ACPI_FAILURE(status)) { /* Ignore error and move on to next device */ return_ACPI_STATUS(AE_OK); } /* * Flags == -1 means that _STA was not found. In this case, we assume that * the device is both present and functional. * * From the ACPI spec, description of _STA: * * "If a device object (including the processor object) does not have an * _STA object, then OSPM assumes that all of the above bits are set (in * other words, the device is present, ..., and functioning)" */ if (flags != ACPI_UINT32_MAX) { walk_info->num_STA++; } /* * Examine the PRESENT and FUNCTIONING status bits * * Note: ACPI spec does not seem to specify behavior for the present but * not functioning case, so we assume functioning if present. */ if (!(flags & ACPI_STA_DEVICE_PRESENT)) { /* Device is not present, we must examine the Functioning bit */ if (flags & ACPI_STA_DEVICE_FUNCTIONING) { /* * Device is not present but is "functioning". In this case, * we will not run _INI, but we continue to examine the children * of this device. * * From the ACPI spec, description of _STA: (Note - no mention * of whether to run _INI or not on the device in question) * * "_STA may return bit 0 clear (not present) with bit 3 set * (device is functional). This case is used to indicate a valid * device for which no device driver should be loaded (for example, * a bridge device.) Children of this device may be present and * valid. OSPM should continue enumeration below a device whose * _STA returns this bit combination" */ return_ACPI_STATUS(AE_OK); } else { /* * Device is not present and is not functioning. We must abort the * walk of this subtree immediately -- don't look at the children * of such a device. * * From the ACPI spec, description of _INI: * * "If the _STA method indicates that the device is not present, * OSPM will not run the _INI and will not examine the children * of the device for _INI methods" */ return_ACPI_STATUS(AE_CTRL_DEPTH); } } /* * The device is present or is assumed present if no _STA exists. * Run the _INI if it exists (not required to exist) * * Note: We know there is an _INI within this subtree, but it may not be * under this particular device, it may be lower in the branch. */ ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname (ACPI_TYPE_METHOD, device_node, METHOD_NAME__INI)); info->prefix_node = device_node; info->pathname = METHOD_NAME__INI; info->parameters = NULL; info->flags = ACPI_IGNORE_RETURN_VALUE; /* * Some hardware relies on this being executed as atomically * as possible (without an NMI being received in the middle of * this) - so disable NMIs and initialize the device: */ status = acpi_ns_evaluate(info); if (ACPI_SUCCESS(status)) { walk_info->num_INI++; if ((acpi_dbg_level <= ACPI_LV_ALL_EXCEPTIONS) && (!(acpi_dbg_level & ACPI_LV_INFO))) { ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, ".")); } } #ifdef ACPI_DEBUG_OUTPUT else if (status != AE_NOT_FOUND) { /* Ignore error and move on to next device */ char *scope_name = acpi_ns_get_external_pathname(info->resolved_node); ACPI_EXCEPTION((AE_INFO, status, "during %s._INI execution", scope_name)); ACPI_FREE(scope_name); } #endif /* Ignore errors from above */ status = AE_OK; /* * The _INI method has been run if present; call the Global Initialization * Handler for this device. */ if (acpi_gbl_init_handler) { status = acpi_gbl_init_handler(device_node, ACPI_INIT_DEVICE_INI); } return_ACPI_STATUS(status); }