| /****************************************************************************** |
| * |
| * Module Name: nsinit - namespace initialization |
| * |
| *****************************************************************************/ |
| |
| /* |
| * Copyright (C) 2000 - 2010, 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); |
| } |