// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: nsinit - namespace initialization
 *
 * Copyright (C) 2000 - 2025, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acevents.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_EXEC,
                          "[Init] Completing Initialization of ACPI Objects\n"));
        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                          "**** Starting initialization of namespace objects ****\n"));
        ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
                              "Final data object initialization: "));

        /* Clear the info block */

        memset(&info, 0, sizeof(struct acpi_init_walk_info));

        /* Walk entire namespace from the supplied root */

        /*
         * TBD: will become ACPI_TYPE_PACKAGE as this type object
         * is now the only one that supports deferred initialization
         * (forward references).
         */
        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,
                              "Namespace contains %u (0x%X) objects\n",
                              info.object_count, info.object_count));

        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                          "%u Control Methods found\n%u Op Regions found\n",
                          info.method_count, 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(u32 flags)
{
        acpi_status status = AE_OK;
        struct acpi_device_walk_info info;
        acpi_handle handle;

        ACPI_FUNCTION_TRACE(ns_initialize_devices);

        if (!(flags & ACPI_NO_DEVICE_INIT)) {
                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                                  "[Init] Initializing ACPI Devices\n"));

                /* 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 "
                                      "and executing _INI/_STA methods:\n"));

                /* 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->relative_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++;
                }

                /*
                 * Execute \_SB._INI.
                 * There appears to be a strict order requirement for \_SB._INI,
                 * which should be evaluated before any _REG evaluations.
                 */
                status = acpi_get_handle(NULL, "\\_SB", &handle);
                if (ACPI_SUCCESS(status)) {
                        memset(info.evaluate_info, 0,
                               sizeof(struct acpi_evaluate_info));
                        info.evaluate_info->prefix_node = handle;
                        info.evaluate_info->relative_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++;
                        }
                }
        }

        /*
         * Run all _REG methods
         *
         * Note: Any objects accessed by the _REG methods will be automatically
         * initialized, even if they contain executable AML (see the call to
         * acpi_ns_initialize_objects below).
         *
         * Note: According to the ACPI specification, we actually needn't execute
         * _REG for system_memory/system_io operation regions, but for PCI_Config
         * operation regions, it is required to evaluate _REG for those on a PCI
         * root bus that doesn't contain _BBN object. So this code is kept here
         * in order not to break things.
         */
        if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                                  "[Init] Executing _REG OpRegion methods\n"));

                status = acpi_ev_initialize_op_regions();
                if (ACPI_FAILURE(status)) {
                        goto error_exit;
                }
        }

        if (!(flags & ACPI_NO_DEVICE_INIT)) {

                /* 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,
                                      "    Executed %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_package
 *
 * PARAMETERS:  obj_handle      - Node
 *              level           - Current nesting level
 *              context         - Not used
 *              return_value    - Not used
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every package
 *              within the namespace. Used during dynamic load of an SSDT.
 *
 ******************************************************************************/

acpi_status
acpi_ns_init_one_package(acpi_handle obj_handle,
                         u32 level, void *context, void **return_value)
{
        acpi_status status;
        union acpi_operand_object *obj_desc;
        struct acpi_namespace_node *node =
            (struct acpi_namespace_node *)obj_handle;

        obj_desc = acpi_ns_get_attached_object(node);
        if (!obj_desc) {
                return (AE_OK);
        }

        /* Exit if package is already initialized */

        if (obj_desc->package.flags & AOPOBJ_DATA_VALID) {
                return (AE_OK);
        }

        status = acpi_ds_get_package_arguments(obj_desc);
        if (ACPI_FAILURE(status)) {
                return (AE_OK);
        }

        status =
            acpi_ut_walk_package_tree(obj_desc, NULL,
                                      acpi_ds_init_package_element, NULL);
        if (ACPI_FAILURE(status)) {
                return (AE_OK);
        }

        obj_desc->package.flags |= AOPOBJ_DATA_VALID;
        return (AE_OK);
}

/*******************************************************************************
 *
 * 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();

        /*
         * Only initialization of Package objects can be deferred, in order
         * to support forward references.
         */
        switch (type) {
        case ACPI_TYPE_LOCAL_BANK_FIELD:

                /* TBD: bank_fields do not require deferred init, remove this code */

                info->field_init++;
                status = acpi_ds_get_bank_field_arguments(obj_desc);
                break;

        case ACPI_TYPE_PACKAGE:

                /* Complete the initialization/resolution of the package object */

                info->package_init++;
                status =
                    acpi_ns_init_one_package(obj_handle, level, NULL, NULL);
                break;

        default:

                /* No other types should get here */

                status = AE_TYPE;
                ACPI_EXCEPTION((AE_INFO, status,
                                "Opcode is not deferred [%4.4s] (%s)",
                                acpi_ut_get_node_name(node),
                                acpi_ut_get_type_name(type)));
                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)));
        }

        /*
         * 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_NAMESEG(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.
         */
        if (!ACPI_COMPARE_NAMESEG(device_node->name.ascii, "_SB_") ||
            device_node->parent != acpi_gbl_root_node) {
                ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
                                (ACPI_TYPE_METHOD, device_node,
                                 METHOD_NAME__INI));

                memset(info, 0, sizeof(struct acpi_evaluate_info));
                info->prefix_node = device_node;
                info->relative_pathname = METHOD_NAME__INI;
                info->parameters = NULL;
                info->flags = ACPI_IGNORE_RETURN_VALUE;

                status = acpi_ns_evaluate(info);
                if (ACPI_SUCCESS(status)) {
                        walk_info->num_INI++;
                }
#ifdef ACPI_DEBUG_OUTPUT
                else if (status != AE_NOT_FOUND) {

                        /* Ignore error and move on to next device */

                        char *scope_name =
                            acpi_ns_get_normalized_pathname(device_node, TRUE);

                        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);
}