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linux/drivers/acpi/utilities/utdelete.c
Robert Moore 44f6c01242 ACPICA 20050408 from Bob Moore 
Fixed three cases in the interpreter where an "index"
argument to an ASL function was still (internally) 32
bits instead of the required 64 bits.  This was the Index
argument to the Index, Mid, and Match operators.

The "strupr" function is now permanently local
(acpi_ut_strupr), since this is not a POSIX-defined
function and not present in most kernel-level C
libraries. References to the C library strupr function
have been removed from the headers.

Completed the deployment of static
functions/prototypes. All prototypes with the static
attribute have been moved from the headers to the owning
C file.

ACPICA 20050329 from Bob Moore

An error is now generated if an attempt is made to create
a Buffer Field of length zero (A CreateField with a length
operand of zero.)

The interpreter now issues a warning whenever executable
code at the module level is detected during ACPI table
load. This will give some idea of the prevalence of this
type of code.

Implemented support for references to named objects (other
than control methods) within package objects.

Enhanced package object output for the debug
object. Package objects are now completely dumped, showing
all elements.

Enhanced miscellaneous object output for the debug
object. Any object can now be written to the debug object
(for example, a device object can be written, and the type
of the object will be displayed.)

The "static" qualifier has been added to all local
functions across the core subsystem.

The number of "long" lines (> 80 chars) within the source
has been significantly reduced, by about 1/3.

Cleaned up all header files to ensure that all CA/iASL
functions are prototyped (even static functions) and the
formatting is consistent.

Two new header files have been added, acopcode.h and
acnames.h.

Removed several obsolete functions that were no longer
used.

Signed-off-by: Len Brown <len.brown@intel.com>
2005-07-12 00:08:52 -04:00

724 lines
18 KiB
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/*******************************************************************************
*
* Module Name: utdelete - object deletion and reference count utilities
*
******************************************************************************/
/*
* Copyright (C) 2000 - 2005, 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/acinterp.h>
#include <acpi/acnamesp.h>
#include <acpi/acevents.h>
#include <acpi/amlcode.h>
#define _COMPONENT ACPI_UTILITIES
ACPI_MODULE_NAME ("utdelete")
/* Local prototypes */
static void
acpi_ut_delete_internal_obj (
union acpi_operand_object *object);
static void
acpi_ut_update_ref_count (
union acpi_operand_object *object,
u32 action);
/*******************************************************************************
*
* FUNCTION: acpi_ut_delete_internal_obj
*
* PARAMETERS: Object - Object to be deleted
*
* RETURN: None
*
* DESCRIPTION: Low level object deletion, after reference counts have been
* updated (All reference counts, including sub-objects!)
*
******************************************************************************/
static void
acpi_ut_delete_internal_obj (
union acpi_operand_object *object)
{
void *obj_pointer = NULL;
union acpi_operand_object *handler_desc;
union acpi_operand_object *second_desc;
union acpi_operand_object *next_desc;
ACPI_FUNCTION_TRACE_PTR ("ut_delete_internal_obj", object);
if (!object) {
return_VOID;
}
/*
* Must delete or free any pointers within the object that are not
* actual ACPI objects (for example, a raw buffer pointer).
*/
switch (ACPI_GET_OBJECT_TYPE (object)) {
case ACPI_TYPE_STRING:
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "**** String %p, ptr %p\n",
object, object->string.pointer));
/* Free the actual string buffer */
if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
/* But only if it is NOT a pointer into an ACPI table */
obj_pointer = object->string.pointer;
}
break;
case ACPI_TYPE_BUFFER:
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "**** Buffer %p, ptr %p\n",
object, object->buffer.pointer));
/* Free the actual buffer */
if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
/* But only if it is NOT a pointer into an ACPI table */
obj_pointer = object->buffer.pointer;
}
break;
case ACPI_TYPE_PACKAGE:
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, " **** Package of count %X\n",
object->package.count));
/*
* Elements of the package are not handled here, they are deleted
* separately
*/
/* Free the (variable length) element pointer array */
obj_pointer = object->package.elements;
break;
case ACPI_TYPE_DEVICE:
if (object->device.gpe_block) {
(void) acpi_ev_delete_gpe_block (object->device.gpe_block);
}
/* Walk the handler list for this device */
handler_desc = object->device.handler;
while (handler_desc) {
next_desc = handler_desc->address_space.next;
acpi_ut_remove_reference (handler_desc);
handler_desc = next_desc;
}
break;
case ACPI_TYPE_MUTEX:
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
"***** Mutex %p, Semaphore %p\n",
object, object->mutex.semaphore));
acpi_ex_unlink_mutex (object);
(void) acpi_os_delete_semaphore (object->mutex.semaphore);
break;
case ACPI_TYPE_EVENT:
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
"***** Event %p, Semaphore %p\n",
object, object->event.semaphore));
(void) acpi_os_delete_semaphore (object->event.semaphore);
object->event.semaphore = NULL;
break;
case ACPI_TYPE_METHOD:
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
"***** Method %p\n", object));
/* Delete the method semaphore if it exists */
if (object->method.semaphore) {
(void) acpi_os_delete_semaphore (object->method.semaphore);
object->method.semaphore = NULL;
}
break;
case ACPI_TYPE_REGION:
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
"***** Region %p\n", object));
second_desc = acpi_ns_get_secondary_object (object);
if (second_desc) {
/*
* Free the region_context if and only if the handler is one of the
* default handlers -- and therefore, we created the context object
* locally, it was not created by an external caller.
*/
handler_desc = object->region.handler;
if (handler_desc) {
if (handler_desc->address_space.hflags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
obj_pointer = second_desc->extra.region_context;
}
acpi_ut_remove_reference (handler_desc);
}
/* Now we can free the Extra object */
acpi_ut_delete_object_desc (second_desc);
}
break;
case ACPI_TYPE_BUFFER_FIELD:
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
"***** Buffer Field %p\n", object));
second_desc = acpi_ns_get_secondary_object (object);
if (second_desc) {
acpi_ut_delete_object_desc (second_desc);
}
break;
default:
break;
}
/* Free any allocated memory (pointer within the object) found above */
if (obj_pointer) {
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Deleting Object Subptr %p\n",
obj_pointer));
ACPI_MEM_FREE (obj_pointer);
}
/* Now the object can be safely deleted */
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Deleting Object %p [%s]\n",
object, acpi_ut_get_object_type_name (object)));
acpi_ut_delete_object_desc (object);
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_delete_internal_object_list
*
* PARAMETERS: obj_list - Pointer to the list to be deleted
*
* RETURN: None
*
* DESCRIPTION: This function deletes an internal object list, including both
* simple objects and package objects
*
******************************************************************************/
void
acpi_ut_delete_internal_object_list (
union acpi_operand_object **obj_list)
{
union acpi_operand_object **internal_obj;
ACPI_FUNCTION_TRACE ("ut_delete_internal_object_list");
/* Walk the null-terminated internal list */
for (internal_obj = obj_list; *internal_obj; internal_obj++) {
acpi_ut_remove_reference (*internal_obj);
}
/* Free the combined parameter pointer list and object array */
ACPI_MEM_FREE (obj_list);
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_update_ref_count
*
* PARAMETERS: Object - Object whose ref count is to be updated
* Action - What to do
*
* RETURN: New ref count
*
* DESCRIPTION: Modify the ref count and return it.
*
******************************************************************************/
static void
acpi_ut_update_ref_count (
union acpi_operand_object *object,
u32 action)
{
u16 count;
u16 new_count;
ACPI_FUNCTION_NAME ("ut_update_ref_count");
if (!object) {
return;
}
count = object->common.reference_count;
new_count = count;
/*
* Perform the reference count action
* (increment, decrement, or force delete)
*/
switch (action) {
case REF_INCREMENT:
new_count++;
object->common.reference_count = new_count;
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
"Obj %p Refs=%X, [Incremented]\n",
object, new_count));
break;
case REF_DECREMENT:
if (count < 1) {
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
"Obj %p Refs=%X, can't decrement! (Set to 0)\n",
object, new_count));
new_count = 0;
}
else {
new_count--;
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
"Obj %p Refs=%X, [Decremented]\n",
object, new_count));
}
if (ACPI_GET_OBJECT_TYPE (object) == ACPI_TYPE_METHOD) {
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
"Method Obj %p Refs=%X, [Decremented]\n",
object, new_count));
}
object->common.reference_count = new_count;
if (new_count == 0) {
acpi_ut_delete_internal_obj (object);
}
break;
case REF_FORCE_DELETE:
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
"Obj %p Refs=%X, Force delete! (Set to 0)\n",
object, count));
new_count = 0;
object->common.reference_count = new_count;
acpi_ut_delete_internal_obj (object);
break;
default:
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown action (%X)\n", action));
break;
}
/*
* Sanity check the reference count, for debug purposes only.
* (A deleted object will have a huge reference count)
*/
if (count > ACPI_MAX_REFERENCE_COUNT) {
ACPI_DEBUG_PRINT ((ACPI_DB_WARN,
"**** Warning **** Large Reference Count (%X) in object %p\n\n",
count, object));
}
return;
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_update_object_reference
*
* PARAMETERS: Object - Increment ref count for this object
* and all sub-objects
* Action - Either REF_INCREMENT or REF_DECREMENT or
* REF_FORCE_DELETE
*
* RETURN: Status
*
* DESCRIPTION: Increment the object reference count
*
* Object references are incremented when:
* 1) An object is attached to a Node (namespace object)
* 2) An object is copied (all subobjects must be incremented)
*
* Object references are decremented when:
* 1) An object is detached from an Node
*
******************************************************************************/
acpi_status
acpi_ut_update_object_reference (
union acpi_operand_object *object,
u16 action)
{
acpi_status status;
u32 i;
union acpi_generic_state *state_list = NULL;
union acpi_generic_state *state;
union acpi_operand_object *tmp;
ACPI_FUNCTION_TRACE_PTR ("ut_update_object_reference", object);
/* Ignore a null object ptr */
if (!object) {
return_ACPI_STATUS (AE_OK);
}
/* Make sure that this isn't a namespace handle */
if (ACPI_GET_DESCRIPTOR_TYPE (object) == ACPI_DESC_TYPE_NAMED) {
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
"Object %p is NS handle\n", object));
return_ACPI_STATUS (AE_OK);
}
state = acpi_ut_create_update_state (object, action);
while (state) {
object = state->update.object;
action = state->update.value;
acpi_ut_delete_generic_state (state);
/*
* All sub-objects must have their reference count incremented also.
* Different object types have different subobjects.
*/
switch (ACPI_GET_OBJECT_TYPE (object)) {
case ACPI_TYPE_DEVICE:
tmp = object->device.system_notify;
if (tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
object->device.system_notify = NULL;
acpi_ut_update_ref_count (tmp, action);
tmp = object->device.device_notify;
if (tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
object->device.device_notify = NULL;
acpi_ut_update_ref_count (tmp, action);
break;
case ACPI_TYPE_PACKAGE:
/*
* We must update all the sub-objects of the package
* (Each of whom may have their own sub-objects, etc.
*/
for (i = 0; i < object->package.count; i++) {
/*
* Push each element onto the stack for later processing.
* Note: There can be null elements within the package,
* these are simply ignored
*/
status = acpi_ut_create_update_state_and_push (
object->package.elements[i], action, &state_list);
if (ACPI_FAILURE (status)) {
goto error_exit;
}
tmp = object->package.elements[i];
if (tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
object->package.elements[i] = NULL;
}
break;
case ACPI_TYPE_BUFFER_FIELD:
status = acpi_ut_create_update_state_and_push (
object->buffer_field.buffer_obj, action, &state_list);
if (ACPI_FAILURE (status)) {
goto error_exit;
}
tmp = object->buffer_field.buffer_obj;
if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
object->buffer_field.buffer_obj = NULL;
break;
case ACPI_TYPE_LOCAL_REGION_FIELD:
status = acpi_ut_create_update_state_and_push (
object->field.region_obj, action, &state_list);
if (ACPI_FAILURE (status)) {
goto error_exit;
}
tmp = object->field.region_obj;
if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
object->field.region_obj = NULL;
break;
case ACPI_TYPE_LOCAL_BANK_FIELD:
status = acpi_ut_create_update_state_and_push (
object->bank_field.bank_obj, action, &state_list);
if (ACPI_FAILURE (status)) {
goto error_exit;
}
tmp = object->bank_field.bank_obj;
if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
object->bank_field.bank_obj = NULL;
status = acpi_ut_create_update_state_and_push (
object->bank_field.region_obj, action, &state_list);
if (ACPI_FAILURE (status)) {
goto error_exit;
}
tmp = object->bank_field.region_obj;
if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
object->bank_field.region_obj = NULL;
break;
case ACPI_TYPE_LOCAL_INDEX_FIELD:
status = acpi_ut_create_update_state_and_push (
object->index_field.index_obj, action, &state_list);
if (ACPI_FAILURE (status)) {
goto error_exit;
}
tmp = object->index_field.index_obj;
if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
object->index_field.index_obj = NULL;
status = acpi_ut_create_update_state_and_push (
object->index_field.data_obj, action, &state_list);
if (ACPI_FAILURE (status)) {
goto error_exit;
}
tmp = object->index_field.data_obj;
if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
object->index_field.data_obj = NULL;
break;
case ACPI_TYPE_LOCAL_REFERENCE:
/*
* The target of an Index (a package, string, or buffer) must track
* changes to the ref count of the index.
*/
if (object->reference.opcode == AML_INDEX_OP) {
status = acpi_ut_create_update_state_and_push (
object->reference.object, action, &state_list);
if (ACPI_FAILURE (status)) {
goto error_exit;
}
}
break;
case ACPI_TYPE_REGION:
default:
/* No subobjects */
break;
}
/*
* Now we can update the count in the main object. This can only
* happen after we update the sub-objects in case this causes the
* main object to be deleted.
*/
acpi_ut_update_ref_count (object, action);
/* Move on to the next object to be updated */
state = acpi_ut_pop_generic_state (&state_list);
}
return_ACPI_STATUS (AE_OK);
error_exit:
ACPI_REPORT_ERROR (("Could not update object reference count, %s\n",
acpi_format_exception (status)));
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_add_reference
*
* PARAMETERS: Object - Object whose reference count is to be
* incremented
*
* RETURN: None
*
* DESCRIPTION: Add one reference to an ACPI object
*
******************************************************************************/
void
acpi_ut_add_reference (
union acpi_operand_object *object)
{
ACPI_FUNCTION_TRACE_PTR ("ut_add_reference", object);
/* Ensure that we have a valid object */
if (!acpi_ut_valid_internal_object (object)) {
return_VOID;
}
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
"Obj %p Current Refs=%X [To Be Incremented]\n",
object, object->common.reference_count));
/* Increment the reference count */
(void) acpi_ut_update_object_reference (object, REF_INCREMENT);
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_remove_reference
*
* PARAMETERS: Object - Object whose ref count will be decremented
*
* RETURN: None
*
* DESCRIPTION: Decrement the reference count of an ACPI internal object
*
******************************************************************************/
void
acpi_ut_remove_reference (
union acpi_operand_object *object)
{
ACPI_FUNCTION_TRACE_PTR ("ut_remove_reference", object);
/*
* Allow a NULL pointer to be passed in, just ignore it. This saves
* each caller from having to check. Also, ignore NS nodes.
*
*/
if (!object ||
(ACPI_GET_DESCRIPTOR_TYPE (object) == ACPI_DESC_TYPE_NAMED)) {
return_VOID;
}
/* Ensure that we have a valid object */
if (!acpi_ut_valid_internal_object (object)) {
return_VOID;
}
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
"Obj %p Current Refs=%X [To Be Decremented]\n",
object, object->common.reference_count));
/*
* Decrement the reference count, and only actually delete the object
* if the reference count becomes 0. (Must also decrement the ref count
* of all subobjects!)
*/
(void) acpi_ut_update_object_reference (object, REF_DECREMENT);
return_VOID;
}
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