async_tx: avoid the async xor_zero_sum path when src_cnt > device->max_xor

[wrt350n-kernel.git] / drivers / acpi / namespace / nsinit.c

/******************************************************************************
 *
 * Module Name: nsinit - namespace initialization
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2007, R. Byron Moore
 * 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 <acpi/acnamesp.h>
#include <acpi/acdispat.h>
#include <acpi/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,
                                     &info, NULL);
        if (ACPI_FAILURE(status)) {
                ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
        }

        ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
                              "\nInitialized %hd/%hd Regions %hd/%hd Fields %hd/%hd Buffers %hd/%hd Packages (%hd 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,
                          "%hd Control Methods found\n", info.method_count));
        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                          "%hd 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, &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;
        }

        /* 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, &info, NULL);

        ACPI_FREE(info.evaluate_info);
        if (ACPI_FAILURE(status)) {
                goto error_exit;
        }

        ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
                              "\nExecuted %hd _INI methods requiring %hd _STA executions (examined %hd 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_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_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 = acpi_ns_get_parent_node(node);
        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 = acpi_ns_get_parent_node(parent_node);
                }
                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->parameter_type = ACPI_PARAM_ARGS;
        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:
         */
        acpi_nmi_disable();
        status = acpi_ns_evaluate(info);
        acpi_nmi_enable();

        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);
}