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evrgnini.c

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

/*
 * 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/acevents.h>
#include <acpi/acnamesp.h>

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evrgnini")

/* Local prototypes */
static u8 acpi_ev_match_pci_root_bridge(char *id);

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;
      acpi_integer 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 = acpi_ns_get_parent_node(region_obj->region.node);

      /*
       * 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 = acpi_ns_get_parent_node(pci_root_node);
            }

            /* 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 = acpi_ns_get_parent_node(pci_device_node);
      }

      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 this device's pci_id */

      acpi_os_derive_pci_id(pci_root_node, region_obj->region.node, &pci_id);

      *region_context = pci_id;
      return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_match_pci_root_bridge
 *
 * PARAMETERS:  Id              - The HID/CID in string format
 *
 * RETURN:      TRUE if the Id is a match for a PCI/PCI-Express Root Bridge
 *
 * DESCRIPTION: Determine if the input ID is a PCI Root Bridge ID.
 *
 ******************************************************************************/

static u8 acpi_ev_match_pci_root_bridge(char *id)
{

      /*
       * Check if this is a PCI root.
       * ACPI 3.0+: check for a PCI Express root also.
       */
      if (!(ACPI_STRNCMP(id,
                     PCI_ROOT_HID_STRING,
                     sizeof(PCI_ROOT_HID_STRING))) ||
          !(ACPI_STRNCMP(id,
                     PCI_EXPRESS_ROOT_HID_STRING,
                     sizeof(PCI_EXPRESS_ROOT_HID_STRING)))) {
            return (TRUE);
      }

      return (FALSE);
}

/*******************************************************************************
 *
 * 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 acpi_compatible_id_list *cid;
      acpi_native_uint i;

      /*
       * Get the _HID and check for a PCI Root Bridge
       */
      status = acpi_ut_execute_HID(node, &hid);
      if (ACPI_FAILURE(status)) {
            return (FALSE);
      }

      if (acpi_ev_match_pci_root_bridge(hid.value)) {
            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_ev_match_pci_root_bridge(cid->id[i].value)) {
                  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 = acpi_ns_get_parent_node(region_obj->region.node);
      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;

                  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, 1);

                              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 = acpi_ns_get_parent_node(node);
      }

      /* 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);
}

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