nsinit.c

Go to the documentation of this file.

/******************************************************************************
 *
 * 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);
}