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linux/drivers/acpi/events/evrgnini.c

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/******************************************************************************
*
* 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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