Use dentry_path() to create full path to inode object

[pohmelfs.git] / drivers / acpi / acpica / evrgnini.c

/******************************************************************************
 *
 * Module Name: evrgnini- ACPI address_space (op_region) init
 *
 *****************************************************************************/

/*
 * 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 "acevents.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evrgnini")

/* Local prototypes */
static u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_system_memory_region_setup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              handler_context     - Address space handler context
 *              region_context      - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Setup a system_memory operation region
 *
 ******************************************************************************/

acpi_status
acpi_ev_system_memory_region_setup(acpi_handle handle,
                                   u32 function,
                                   void *handler_context, void **region_context)
{
        union acpi_operand_object *region_desc =
            (union acpi_operand_object *)handle;
        struct acpi_mem_space_context *local_region_context;

        ACPI_FUNCTION_TRACE(ev_system_memory_region_setup);

        if (function == ACPI_REGION_DEACTIVATE) {
                if (*region_context) {
                        local_region_context =
                            (struct acpi_mem_space_context *)*region_context;

                        /* Delete a cached mapping if present */

                        if (local_region_context->mapped_length) {
                                acpi_os_unmap_memory(local_region_context->
                                                     mapped_logical_address,
                                                     local_region_context->
                                                     mapped_length);
                        }
                        ACPI_FREE(local_region_context);
                        *region_context = NULL;
                }
                return_ACPI_STATUS(AE_OK);
        }

        /* Create a new context */

        local_region_context =
            ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_mem_space_context));
        if (!(local_region_context)) {
                return_ACPI_STATUS(AE_NO_MEMORY);
        }

        /* Save the region length and address for use in the handler */

        local_region_context->length = region_desc->region.length;
        local_region_context->address = region_desc->region.address;

        *region_context = local_region_context;
        return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_io_space_region_setup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              handler_context     - Address space handler context
 *              region_context      - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Setup a IO operation region
 *
 ******************************************************************************/

acpi_status
acpi_ev_io_space_region_setup(acpi_handle handle,
                              u32 function,
                              void *handler_context, void **region_context)
{
        ACPI_FUNCTION_TRACE(ev_io_space_region_setup);

        if (function == ACPI_REGION_DEACTIVATE) {
                *region_context = NULL;
        } else {
                *region_context = handler_context;
        }

        return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_pci_config_region_setup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              handler_context     - Address space handler context
 *              region_context      - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Setup a PCI_Config operation region
 *
 * MUTEX:       Assumes namespace is not locked
 *
 ******************************************************************************/

acpi_status
acpi_ev_pci_config_region_setup(acpi_handle handle,
                                u32 function,
                                void *handler_context, void **region_context)
{
        acpi_status status = AE_OK;
        u64 pci_value;
        struct acpi_pci_id *pci_id = *region_context;
        union acpi_operand_object *handler_obj;
        struct acpi_namespace_node *parent_node;
        struct acpi_namespace_node *pci_root_node;
        struct acpi_namespace_node *pci_device_node;
        union acpi_operand_object *region_obj =
            (union acpi_operand_object *)handle;

        ACPI_FUNCTION_TRACE(ev_pci_config_region_setup);

        handler_obj = region_obj->region.handler;
        if (!handler_obj) {
                /*
                 * No installed handler. This shouldn't happen because the dispatch
                 * routine checks before we get here, but we check again just in case.
                 */
                ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
                                  "Attempting to init a region %p, with no handler\n",
                                  region_obj));
                return_ACPI_STATUS(AE_NOT_EXIST);
        }

        *region_context = NULL;
        if (function == ACPI_REGION_DEACTIVATE) {
                if (pci_id) {
                        ACPI_FREE(pci_id);
                }
                return_ACPI_STATUS(status);
        }

        parent_node = region_obj->region.node->parent;

        /*
         * Get the _SEG and _BBN values from the device upon which the handler
         * is installed.
         *
         * We need to get the _SEG and _BBN objects relative to the PCI BUS device.
         * This is the device the handler has been registered to handle.
         */

        /*
         * If the address_space.Node is still pointing to the root, we need
         * to scan upward for a PCI Root bridge and re-associate the op_region
         * handlers with that device.
         */
        if (handler_obj->address_space.node == acpi_gbl_root_node) {

                /* Start search from the parent object */

                pci_root_node = parent_node;
                while (pci_root_node != acpi_gbl_root_node) {

                        /* Get the _HID/_CID in order to detect a root_bridge */

                        if (acpi_ev_is_pci_root_bridge(pci_root_node)) {

                                /* Install a handler for this PCI root bridge */

                                status =
                                    acpi_install_address_space_handler((acpi_handle) pci_root_node, ACPI_ADR_SPACE_PCI_CONFIG, ACPI_DEFAULT_HANDLER, NULL, NULL);
                                if (ACPI_FAILURE(status)) {
                                        if (status == AE_SAME_HANDLER) {
                                                /*
                                                 * It is OK if the handler is already installed on the
                                                 * root bridge. Still need to return a context object
                                                 * for the new PCI_Config operation region, however.
                                                 */
                                                status = AE_OK;
                                        } else {
                                                ACPI_EXCEPTION((AE_INFO, status,
                                                                "Could not install PciConfig handler "
                                                                "for Root Bridge %4.4s",
                                                                acpi_ut_get_node_name
                                                                (pci_root_node)));
                                        }
                                }
                                break;
                        }

                        pci_root_node = pci_root_node->parent;
                }

                /* PCI root bridge not found, use namespace root node */
        } else {
                pci_root_node = handler_obj->address_space.node;
        }

        /*
         * If this region is now initialized, we are done.
         * (install_address_space_handler could have initialized it)
         */
        if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) {
                return_ACPI_STATUS(AE_OK);
        }

        /* Region is still not initialized. Create a new context */

        pci_id = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pci_id));
        if (!pci_id) {
                return_ACPI_STATUS(AE_NO_MEMORY);
        }

        /*
         * For PCI_Config space access, we need the segment, bus, device and
         * function numbers. Acquire them here.
         *
         * Find the parent device object. (This allows the operation region to be
         * within a subscope under the device, such as a control method.)
         */
        pci_device_node = region_obj->region.node;
        while (pci_device_node && (pci_device_node->type != ACPI_TYPE_DEVICE)) {
                pci_device_node = pci_device_node->parent;
        }

        if (!pci_device_node) {
                ACPI_FREE(pci_id);
                return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
        }

        /*
         * Get the PCI device and function numbers from the _ADR object
         * contained in the parent's scope.
         */
        status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR,
                                                 pci_device_node, &pci_value);

        /*
         * The default is zero, and since the allocation above zeroed the data,
         * just do nothing on failure.
         */
        if (ACPI_SUCCESS(status)) {
                pci_id->device = ACPI_HIWORD(ACPI_LODWORD(pci_value));
                pci_id->function = ACPI_LOWORD(ACPI_LODWORD(pci_value));
        }

        /* The PCI segment number comes from the _SEG method */

        status = acpi_ut_evaluate_numeric_object(METHOD_NAME__SEG,
                                                 pci_root_node, &pci_value);
        if (ACPI_SUCCESS(status)) {
                pci_id->segment = ACPI_LOWORD(pci_value);
        }

        /* The PCI bus number comes from the _BBN method */

        status = acpi_ut_evaluate_numeric_object(METHOD_NAME__BBN,
                                                 pci_root_node, &pci_value);
        if (ACPI_SUCCESS(status)) {
                pci_id->bus = ACPI_LOWORD(pci_value);
        }

        /* Complete/update the PCI ID for this device */

        status =
            acpi_hw_derive_pci_id(pci_id, pci_root_node,
                                  region_obj->region.node);
        if (ACPI_FAILURE(status)) {
                ACPI_FREE(pci_id);
                return_ACPI_STATUS(status);
        }

        *region_context = pci_id;
        return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_is_pci_root_bridge
 *
 * PARAMETERS:  Node            - Device node being examined
 *
 * RETURN:      TRUE if device is a PCI/PCI-Express Root Bridge
 *
 * DESCRIPTION: Determine if the input device represents a PCI Root Bridge by
 *              examining the _HID and _CID for the device.
 *
 ******************************************************************************/

static u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node)
{
        acpi_status status;
        struct acpica_device_id *hid;
        struct acpica_device_id_list *cid;
        u32 i;
        u8 match;

        /* Get the _HID and check for a PCI Root Bridge */

        status = acpi_ut_execute_HID(node, &hid);
        if (ACPI_FAILURE(status)) {
                return (FALSE);
        }

        match = acpi_ut_is_pci_root_bridge(hid->string);
        ACPI_FREE(hid);

        if (match) {
                return (TRUE);
        }

        /* The _HID did not match. Get the _CID and check for a PCI Root Bridge */

        status = acpi_ut_execute_CID(node, &cid);
        if (ACPI_FAILURE(status)) {
                return (FALSE);
        }

        /* Check all _CIDs in the returned list */

        for (i = 0; i < cid->count; i++) {
                if (acpi_ut_is_pci_root_bridge(cid->ids[i].string)) {
                        ACPI_FREE(cid);
                        return (TRUE);
                }
        }

        ACPI_FREE(cid);
        return (FALSE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_pci_bar_region_setup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              handler_context     - Address space handler context
 *              region_context      - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Setup a pci_bAR operation region
 *
 * MUTEX:       Assumes namespace is not locked
 *
 ******************************************************************************/

acpi_status
acpi_ev_pci_bar_region_setup(acpi_handle handle,
                             u32 function,
                             void *handler_context, void **region_context)
{
        ACPI_FUNCTION_TRACE(ev_pci_bar_region_setup);

        return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_cmos_region_setup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              handler_context     - Address space handler context
 *              region_context      - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Setup a CMOS operation region
 *
 * MUTEX:       Assumes namespace is not locked
 *
 ******************************************************************************/

acpi_status
acpi_ev_cmos_region_setup(acpi_handle handle,
                          u32 function,
                          void *handler_context, void **region_context)
{
        ACPI_FUNCTION_TRACE(ev_cmos_region_setup);

        return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_default_region_setup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              handler_context     - Address space handler context
 *              region_context      - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Default region initialization
 *
 ******************************************************************************/

acpi_status
acpi_ev_default_region_setup(acpi_handle handle,
                             u32 function,
                             void *handler_context, void **region_context)
{
        ACPI_FUNCTION_TRACE(ev_default_region_setup);

        if (function == ACPI_REGION_DEACTIVATE) {
                *region_context = NULL;
        } else {
                *region_context = handler_context;
        }

        return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_initialize_region
 *
 * PARAMETERS:  region_obj      - Region we are initializing
 *              acpi_ns_locked  - Is namespace locked?
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initializes the region, finds any _REG methods and saves them
 *              for execution at a later time
 *
 *              Get the appropriate address space handler for a newly
 *              created region.
 *
 *              This also performs address space specific initialization. For
 *              example, PCI regions must have an _ADR object that contains
 *              a PCI address in the scope of the definition. This address is
 *              required to perform an access to PCI config space.
 *
 * MUTEX:       Interpreter should be unlocked, because we may run the _REG
 *              method for this region.
 *
 ******************************************************************************/

acpi_status
acpi_ev_initialize_region(union acpi_operand_object *region_obj,
                          u8 acpi_ns_locked)
{
        union acpi_operand_object *handler_obj;
        union acpi_operand_object *obj_desc;
        acpi_adr_space_type space_id;
        struct acpi_namespace_node *node;
        acpi_status status;
        struct acpi_namespace_node *method_node;
        acpi_name *reg_name_ptr = (acpi_name *) METHOD_NAME__REG;
        union acpi_operand_object *region_obj2;

        ACPI_FUNCTION_TRACE_U32(ev_initialize_region, acpi_ns_locked);

        if (!region_obj) {
                return_ACPI_STATUS(AE_BAD_PARAMETER);
        }

        if (region_obj->common.flags & AOPOBJ_OBJECT_INITIALIZED) {
                return_ACPI_STATUS(AE_OK);
        }

        region_obj2 = acpi_ns_get_secondary_object(region_obj);
        if (!region_obj2) {
                return_ACPI_STATUS(AE_NOT_EXIST);
        }

        node = region_obj->region.node->parent;
        space_id = region_obj->region.space_id;

        /* Setup defaults */

        region_obj->region.handler = NULL;
        region_obj2->extra.method_REG = NULL;
        region_obj->common.flags &= ~(AOPOBJ_SETUP_COMPLETE);
        region_obj->common.flags |= AOPOBJ_OBJECT_INITIALIZED;

        /* Find any "_REG" method associated with this region definition */

        status =
            acpi_ns_search_one_scope(*reg_name_ptr, node, ACPI_TYPE_METHOD,
                                     &method_node);
        if (ACPI_SUCCESS(status)) {
                /*
                 * The _REG method is optional and there can be only one per region
                 * definition. This will be executed when the handler is attached
                 * or removed
                 */
                region_obj2->extra.method_REG = method_node;
        }

        /*
         * The following loop depends upon the root Node having no parent
         * ie: acpi_gbl_root_node->parent_entry being set to NULL
         */
        while (node) {

                /* Check to see if a handler exists */

                handler_obj = NULL;
                obj_desc = acpi_ns_get_attached_object(node);
                if (obj_desc) {

                        /* Can only be a handler if the object exists */

                        switch (node->type) {
                        case ACPI_TYPE_DEVICE:

                                handler_obj = obj_desc->device.handler;
                                break;

                        case ACPI_TYPE_PROCESSOR:

                                handler_obj = obj_desc->processor.handler;
                                break;

                        case ACPI_TYPE_THERMAL:

                                handler_obj = obj_desc->thermal_zone.handler;
                                break;

                        case ACPI_TYPE_METHOD:
                                /*
                                 * If we are executing module level code, the original
                                 * Node's object was replaced by this Method object and we
                                 * saved the handler in the method object.
                                 *
                                 * See acpi_ns_exec_module_code
                                 */
                                if (obj_desc->method.
                                    info_flags & ACPI_METHOD_MODULE_LEVEL) {
                                        handler_obj =
                                            obj_desc->method.dispatch.handler;
                                }
                                break;

                        default:
                                /* Ignore other objects */
                                break;
                        }

                        while (handler_obj) {

                                /* Is this handler of the correct type? */

                                if (handler_obj->address_space.space_id ==
                                    space_id) {

                                        /* Found correct handler */

                                        ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
                                                          "Found handler %p for region %p in obj %p\n",
                                                          handler_obj,
                                                          region_obj,
                                                          obj_desc));

                                        status =
                                            acpi_ev_attach_region(handler_obj,
                                                                  region_obj,
                                                                  acpi_ns_locked);

                                        /*
                                         * Tell all users that this region is usable by
                                         * running the _REG method
                                         */
                                        if (acpi_ns_locked) {
                                                status =
                                                    acpi_ut_release_mutex
                                                    (ACPI_MTX_NAMESPACE);
                                                if (ACPI_FAILURE(status)) {
                                                        return_ACPI_STATUS
                                                            (status);
                                                }
                                        }

                                        status =
                                            acpi_ev_execute_reg_method
                                            (region_obj, ACPI_REG_CONNECT);

                                        if (acpi_ns_locked) {
                                                status =
                                                    acpi_ut_acquire_mutex
                                                    (ACPI_MTX_NAMESPACE);
                                                if (ACPI_FAILURE(status)) {
                                                        return_ACPI_STATUS
                                                            (status);
                                                }
                                        }

                                        return_ACPI_STATUS(AE_OK);
                                }

                                /* Try next handler in the list */

                                handler_obj = handler_obj->address_space.next;
                        }
                }

                /* This node does not have the handler we need; Pop up one level */

                node = node->parent;
        }

        /* If we get here, there is no handler for this region */

        ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
                          "No handler for RegionType %s(%X) (RegionObj %p)\n",
                          acpi_ut_get_region_name(space_id), space_id,
                          region_obj));

        return_ACPI_STATUS(AE_NOT_EXIST);
}