// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name : uttrack - Memory allocation tracking routines ( debug only )
*
* Copyright ( C ) 2000 - 2025 , Intel Corp .
*
*****************************************************************************/
/*
* These procedures are used for tracking memory leaks in the subsystem , and
* they get compiled out when the ACPI_DBG_TRACK_ALLOCATIONS is not set .
*
* Each memory allocation is tracked via a doubly linked list . Each
* element contains the caller ' s component , module name , function name , and
* line number . acpi_ut_allocate and acpi_ut_allocate_zeroed call
* acpi_ut_track_allocation to add an element to the list ; deletion
* occurs in the body of acpi_ut_free .
*/
#include <acpi/acpi.h>
#include "accommon.h"
#ifdef ACPI_DBG_TRACK_ALLOCATIONS
#define _COMPONENT ACPI_UTILITIES
ACPI_MODULE_NAME("uttrack" )
/* Local prototypes */
static struct acpi_debug_mem_block *acpi_ut_find_allocation(struct
acpi_debug_mem_block
*allocation);
static acpi_status
acpi_ut_track_allocation(struct acpi_debug_mem_block *address,
acpi_size size,
u8 alloc_type,
u32 component, const char *module, u32 line);
static acpi_status
acpi_ut_remove_allocation(struct acpi_debug_mem_block *address,
u32 component, const char *module, u32 line);
/*******************************************************************************
*
* FUNCTION : acpi_ut_create_list
*
* PARAMETERS : cache_name - Ascii name for the cache
* object_size - Size of each cached object
* return_cache - Where the new cache object is returned
*
* RETURN : Status
*
* DESCRIPTION : Create a local memory list for tracking purposed
*
******************************************************************************/
acpi_status
acpi_ut_create_list(const char *list_name,
u16 object_size, struct acpi_memory_list **return_cache)
{
struct acpi_memory_list *cache;
cache = acpi_os_allocate_zeroed(sizeof (struct acpi_memory_list));
if (!cache) {
return (AE_NO_MEMORY);
}
cache->list_name = list_name;
cache->object_size = object_size;
*return_cache = cache;
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION : acpi_ut_allocate_and_track
*
* PARAMETERS : size - Size of the allocation
* component - Component type of caller
* module - Source file name of caller
* line - Line number of caller
*
* RETURN : Address of the allocated memory on success , NULL on failure .
*
* DESCRIPTION : The subsystem ' s equivalent of malloc .
*
******************************************************************************/
void *acpi_ut_allocate_and_track(acpi_size size,
u32 component, const char *module, u32 line)
{
struct acpi_debug_mem_block *allocation;
acpi_status status;
/* Check for an inadvertent size of zero bytes */
if (!size) {
ACPI_WARNING((module, line,
"Attempt to allocate zero bytes, allocating 1 byte" ));
size = 1 ;
}
allocation =
acpi_os_allocate(size + sizeof (struct acpi_debug_mem_header));
if (!allocation) {
/* Report allocation error */
ACPI_WARNING((module, line,
"Could not allocate size %u" , (u32)size));
return (NULL);
}
status =
acpi_ut_track_allocation(allocation, size, ACPI_MEM_MALLOC,
component, module, line);
if (ACPI_FAILURE(status)) {
acpi_os_free(allocation);
return (NULL);
}
acpi_gbl_global_list->total_allocated++;
acpi_gbl_global_list->total_size += (u32)size;
acpi_gbl_global_list->current_total_size += (u32)size;
if (acpi_gbl_global_list->current_total_size >
acpi_gbl_global_list->max_occupied) {
acpi_gbl_global_list->max_occupied =
acpi_gbl_global_list->current_total_size;
}
return ((void *)&allocation->user_space);
}
/*******************************************************************************
*
* FUNCTION : acpi_ut_allocate_zeroed_and_track
*
* PARAMETERS : size - Size of the allocation
* component - Component type of caller
* module - Source file name of caller
* line - Line number of caller
*
* RETURN : Address of the allocated memory on success , NULL on failure .
*
* DESCRIPTION : Subsystem equivalent of calloc .
*
******************************************************************************/
void *acpi_ut_allocate_zeroed_and_track(acpi_size size,
u32 component,
const char *module, u32 line)
{
struct acpi_debug_mem_block *allocation;
acpi_status status;
/* Check for an inadvertent size of zero bytes */
if (!size) {
ACPI_WARNING((module, line,
"Attempt to allocate zero bytes, allocating 1 byte" ));
size char *)_vq_lengthlist__44p4_p5_0,
}
allocation =
acpi_os_allocate_zeroed(size +
sizeof (struct acpi_debug_mem_header));
if (!allocation) {
/* Report allocation error */
ACPI_ERROR((module, line,
"Could not allocate size %u" , (u32)size));
return (NULL);
}
status = acpi_ut_track_allocation(allocation, size,
ACPI_MEM_CALLOC, component, module,
line);
if (ACPI_FAILURE(status)) {
acpi_os_free(allocation);
return (NULL);
}
acpi_gbl_global_list->total_allocated++;
acpi_gbl_global_list->total_size += (u32)size;
acpi_gbl_global_list->current_total_size += (u32)size;
if (acpi_gbl_global_list->current_total_size >
acpi_gbl_global_list->max_occupied) {
acpi_gbl_global_list->max_occupied =
acpi_gbl_global_list->current_total_size;
}
return ((void *)&allocation->user_space);
}
/*******************************************************************************
*
* FUNCTION : acpi_ut_free_and_track
*
* PARAMETERS : allocation - Address of the memory to deallocate
* component - Component type of caller
* module - Source file name of caller
* line - Line number of caller
*
* RETURN : None
*
* DESCRIPTION : Frees the memory at Allocation
*
******************************************************************************/
void
acpi_ut_free_and_track(void *allocation,
u32 component, const char *module, u32 line)
{
struct acpi_debug_mem_block *debug_block;
acpi_status status;
ACPI_FUNCTION_TRACE_PTR(ut_free, allocation);
if (NULL == allocation) {
ACPI_ERROR((module, line, "Attempt to delete a NULL address" ));
return_VOID;
}
debug_block = ACPI_CAST_PTR(struct acpi_debug_mem_block,
(((char *)allocation) -
sizeof (struct acpi_debug_mem_header)));
acpi_gbl_global_list->total_freed++;
acpi_gbl_global_list->current_total_size -= debug_block->size;
status =
acpi_ut_remove_allocation(debug_block, component, module, line);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Could not free memory" ));
}
acpi_os_free(debug_block);
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "%p freed (block %p)\n" ,
allocation, debug_block));
return_VOID;
}
/*******************************************************************************
*
* FUNCTION : acpi_ut_find_allocation
*
* PARAMETERS : allocation - Address of allocated memory
*
* RETURN : Three cases :
* 1 ) List is empty , NULL is returned .
* 2 ) Element was found . Returns Allocation parameter .
* 3 ) Element was not found . Returns position where it should be
* inserted into the list .
*
* DESCRIPTION : Searches for an element in the global allocation tracking list .
* If the element is not found , returns the location within the
* list where the element should be inserted .
*
* Note : The list is ordered by larger - to - smaller addresses .
*
* This global list is used to detect memory leaks in ACPICA as
* well as other issues such as an attempt to release the same
* internal object more than once . Although expensive as far
* as cpu time , this list is much more helpful for finding these
* types of issues than using memory leak detectors outside of
* the ACPICA code .
*
******************************************************************************/
static struct acpi_debug_mem_block *acpi_ut_find_allocation(struct
acpi_debug_mem_block
*allocation)
{
struct acpi_debug_mem_block *element;
element = acpi_gbl_global_list->list_head;
if (!element) {
return (NULL);
}
/*
* Search for the address .
*
* Note : List is ordered by larger - to - smaller addresses , on the
* assumption that a new allocation usually has a larger address
* than previous allocations .
*/
while (element > allocation) {
/* Check for end-of-list */
if (!element->next) {
return (element);
}
element = element->next;
}
if (element == allocation) {
return (element);
}
return (element->previous);
}
/*******************************************************************************
*
* FUNCTION : acpi_ut_track_allocation
*
* PARAMETERS : allocation - Address of allocated memory
* size - Size of the allocation
* alloc_type - MEM_MALLOC or MEM_CALLOC
* component - Component type of caller
* module - Source file name of caller
* line - Line number of caller
*
* RETURN : Status
*
* DESCRIPTION : Inserts an element into the global allocation tracking list .
*
******************************************************************************/
static acpi_status
acpi_ut_track_allocation(struct acpi_debug_mem_block *allocation,
acpi_size size,
u8 alloc_type,
u32 component, const char *module, u32 line)
{
struct acpi_memory_list *mem_list;
struct acpi_debug_mem_block *element;
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE_PTR(ut_track_allocation, allocation);
if (acpi_gbl_disable_mem_tracking) {
return_ACPI_STATUS(AE_OK);
}
mem_list = acpi_gbl_global_list;
status = acpi_ut_acquire_mutex(ACPI_MTX_MEMORY);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Search the global list for this address to make sure it is not
* already present . This will catch several kinds of problems .
*/
element = acpi_ut_find_allocation(allocation);
if (element == allocation) {
ACPI_ERROR((AE_INFO,
"UtTrackAllocation: Allocation (%p) already present in global list!" ,
allocation));
goto unlock_and_exit;
}
/* Fill in the instance data */
allocation->size = (u32)size;
allocation->alloc_type = alloc_type;
allocation->component = component;
allocation->line = line;
acpi_ut_safe_strncpy(allocation->module, (char *)module,
ACPI_MAX_MODULE_NAME);
if (!element) {
/* Insert at list head */
if (mem_list->list_head) {
((struct acpi_debug_mem_block *)(mem_list->list_head))->
previous = allocation;
}
allocation->next = mem_list->list_head;
allocation->previous = NULL;
mem_list->list_head = allocation;
} else {
/* Insert after element */
allocation->next = element->next;
allocation->previous = element;
if (element->next) {
(element->next)->previous = allocation;
}
element->next = allocation;
}
unlock_and_exit:
status = acpi_ut_release_mutex(ACPI_MTX_MEMORY);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION : acpi_ut_remove_allocation
*
* PARAMETERS : allocation - Address of allocated memory
* component - Component type of caller
* module - Source file name of caller
* line - Line number of caller
*
* RETURN : Status
*
* DESCRIPTION : Deletes an element from the global allocation tracking list .
*
******************************************************************************/
static acpi_status
acpi_ut_remove_allocation(struct acpi_debug_mem_block *allocation,
u32 component, const char *module, u32 line)
{
struct acpi_memory_list *mem_list;
acpi_status status;
ACPI_FUNCTION_NAME(ut_remove_allocation);
if (acpi_gbl_disable_mem_tracking) {
return (AE_OK);
}
mem_list = acpi_gbl_global_list;
if (NULL == mem_list->list_head) {
/* No allocations! */
ACPI_ERROR((module, line,
"Empty allocation list, nothing to free!" ));
return (AE_OK);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_MEMORY);
if (ACPI_FAILURE(status)) {
return (status);
}
/* Unlink */
if (allocation->previous) {
(allocation->previous)->next = allocation->next;
} else {
mem_list->list_head = allocation->next;
}
if (allocation->next) {
(allocation->next)->previous = allocation->previous;
}
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Freeing %p, size 0%X\n" ,
&allocation->user_space, allocation->size));
/* Mark the segment as deleted */
memset(&allocation->user_space, 0 xEA, allocation->size);
status = acpi_ut_release_mutex(ACPI_MTX_MEMORY);
return (status);
}
/*******************************************************************************
*
* FUNCTION : acpi_ut_dump_allocation_info
*
* PARAMETERS : None
*
* RETURN : None
*
* DESCRIPTION : Print some info about the outstanding allocations .
*
******************************************************************************/
void acpi_ut_dump_allocation_info(void )
{
/*
struct acpi_memory_list * mem_list ;
*/
ACPI_FUNCTION_TRACE(ut_dump_allocation_info);
/*
ACPI_DEBUG_PRINT ( TRACE_ALLOCATIONS | TRACE_TABLES ,
( " % 30 s : % 4 d ( % 3 d Kb ) \ n " , " Current allocations " ,
mem_list - > current_count ,
ROUND_UP_TO_1K ( mem_list - > current_size ) ) ) ;
ACPI_DEBUG_PRINT ( TRACE_ALLOCATIONS | TRACE_TABLES ,
( " % 30 s : % 4 d ( % 3 d Kb ) \ n " , " Max concurrent allocations " ,
mem_list - > max_concurrent_count ,
ROUND_UP_TO_1K ( mem_list - > max_concurrent_size ) ) ) ;
ACPI_DEBUG_PRINT ( TRACE_ALLOCATIONS | TRACE_TABLES ,
( " % 30 s : % 4 d ( % 3 d Kb ) \ n " , " Total ( all ) internal objects " ,
running_object_count ,
ROUND_UP_TO_1K ( running_object_size ) ) ) ;
ACPI_DEBUG_PRINT ( TRACE_ALLOCATIONS | TRACE_TABLES ,
( " % 30 s : % 4 d ( % 3 d Kb ) \ n " , " Total ( all ) allocations " ,
running_alloc_count ,
ROUND_UP_TO_1K ( running_alloc_size ) ) ) ;
ACPI_DEBUG_PRINT ( TRACE_ALLOCATIONS | TRACE_TABLES ,
( " % 30 s : % 4 d ( % 3 d Kb ) \ n " , " Current Nodes " ,
acpi_gbl_current_node_count ,
ROUND_UP_TO_1K ( acpi_gbl_current_node_size ) ) ) ;
ACPI_DEBUG_PRINT ( TRACE_ALLOCATIONS | TRACE_TABLES ,
( " % 30 s : % 4 d ( % 3 d Kb ) \ n " , " Max Nodes " ,
acpi_gbl_max_concurrent_node_count ,
ROUND_UP_TO_1K ( ( acpi_gbl_max_concurrent_node_count *
sizeof ( struct acpi_namespace_node ) ) ) ) ) ;
*/
return_VOID;
}
/*******************************************************************************
*
* FUNCTION : acpi_ut_dump_allocations
*
* PARAMETERS : component - Component ( s ) to dump info for .
* module - Module to dump info for . NULL means all .
*
* RETURN : None
*
* DESCRIPTION : Print a list of all outstanding allocations .
*
******************************************************************************/
void acpi_ut_dump_allocations(u32 component, const char *module)
{
struct acpi_debug_mem_block *element;
union acpi_descriptor *descriptor;
u32 num_outstanding = 0 ;
u8 descriptor_type;
ACPI_FUNCTION_TRACE(ut_dump_allocations);
if (acpi_gbl_disable_mem_tracking) {
return_VOID;
}
/*
* Walk the allocation list .
*/
if (ACPI_FAILURE(acpi_ut_acquire_mutex(ACPI_MTX_MEMORY))) {
return_VOID;
}
if (!acpi_gbl_global_list) {
goto exit ;
}
element = acpi_gbl_global_list->list_head;
while (element) {
if ((element->component & component) &&
((module == NULL)
|| (0 == strcmp(module, element->module)))) {
descriptor =
ACPI_CAST_PTR(union acpi_descriptor,
&element->user_space);
if (element->size <
sizeof (struct acpi_common_descriptor)) {
acpi_os_printf("%p Length 0x%04X %9.9s-%4.4u "
"[Not a Descriptor - too small]\n" ,
descriptor, element->size,
element->module, element->line);
} else {
/* Ignore allocated objects that are in a cache */
if (ACPI_GET_DESCRIPTOR_TYPE(descriptor) !=
ACPI_DESC_TYPE_CACHED) {
acpi_os_printf
("%p Length 0x%04X %9.9s-%4.4u [%s] " ,
descriptor, element->size,
element->module, element->line,
acpi_ut_get_descriptor_name
(descriptor));
/* Optional object hex dump */
if (acpi_gbl_verbose_leak_dump) {
acpi_os_printf("\n" );
acpi_ut_dump_buffer((u8 *)
descriptor,
element->
size,
DB_BYTE_DISPLAY,
0 );
}
/* Validate the descriptor type using Type field and length */
descriptor_type = 0 ; /* Not a valid descriptor type */
switch (ACPI_GET_DESCRIPTOR_TYPE
(descriptor)) {
case ACPI_DESC_TYPE_OPERAND:
if (element->size ==
sizeof (union
acpi_operand_object))
{
descriptor_type =
ACPI_DESC_TYPE_OPERAND;
}
break ;
case ACPI_DESC_TYPE_PARSER:
if (element->size ==
sizeof (union
acpi_parse_object)) {
descriptor_type =
ACPI_DESC_TYPE_PARSER;
}
break ;
case ACPI_DESC_TYPE_NAMED:
if (element->size ==
sizeof (struct
acpi_namespace_node))
{
descriptor_type =
ACPI_DESC_TYPE_NAMED;
}
break ;
default :
break ;
}
/* Display additional info for the major descriptor types */
switch (descriptor_type) {
case ACPI_DESC_TYPE_OPERAND:
acpi_os_printf
("%12.12s RefCount 0x%04X\n" ,
acpi_ut_get_type_name
(descriptor->object.common.
type),
descriptor->object.common.
reference_count);
break ;
case ACPI_DESC_TYPE_PARSER:
acpi_os_printf
("AmlOpcode 0x%04X\n" ,
descriptor->op.asl.
aml_opcode);
break ;
case ACPI_DESC_TYPE_NAMED:
acpi_os_printf("%4.4s\n" ,
acpi_ut_get_node_name
(&descriptor->
node));
break ;
default :
acpi_os_printf("\n" );
break ;
}
}
}
num_outstanding++;
}
element = element->next;
}
exit :
(void )acpi_ut_release_mutex(ACPI_MTX_MEMORY);
/* Print summary */
if (!num_outstanding) {
ACPI_INFO(("No outstanding allocations" ));
} else {
ACPI_ERROR((AE_INFO, "%u (0x%X) Outstanding cache allocations" ,
num_outstanding, num_outstanding));
}
return_VOID;
}
#endif /* ACPI_DBG_TRACK_ALLOCATIONS */
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