Linux/Unix编程

开发平台：
Unix_Linux

utalloc.c：源码内容
							/******************************************************************************
 *
 * Module Name: utalloc - local cache and memory allocation routines
 *              $Revision: 106 $
 *
 *****************************************************************************/
/*
 *  Copyright (C) 2000, 2001 R. Byron Moore
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include "acpi.h"
#include "acparser.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "acglobal.h"
#define _COMPONENT          ACPI_UTILITIES
	 MODULE_NAME         ("utalloc")
/******************************************************************************
 *
 * FUNCTION:    Acpi_ut_release_to_cache
 *
 * PARAMETERS:  List_id             - Memory list/cache ID
 *              Object              - The object to be released
 *
 * RETURN:      None
 *
 * DESCRIPTION: Release an object to the specified cache.  If cache is full,
 *              the object is deleted.
 *
 ******************************************************************************/
void
acpi_ut_release_to_cache (
	u32                     list_id,
	void                    *object)
{
	ACPI_MEMORY_LIST        *cache_info;
	FUNCTION_ENTRY ();
	/* If walk cache is full, just free this wallkstate object */
	cache_info = &acpi_gbl_memory_lists[list_id];
	if (cache_info->cache_depth >= cache_info->max_cache_depth) {
		ACPI_MEM_FREE (object);
		ACPI_MEM_TRACKING (cache_info->total_freed++);
	}
	/* Otherwise put this object back into the cache */
	else {
		acpi_ut_acquire_mutex (ACPI_MTX_CACHES);
		/* Mark the object as cached */
		MEMSET (object, 0xCA, cache_info->object_size);
		((acpi_operand_object *) object)->common.data_type = ACPI_CACHED_OBJECT;
		/* Put the object at the head of the cache list */
		* (char **) (((char *) object) + cache_info->link_offset) = cache_info->list_head;
		cache_info->list_head = object;
		cache_info->cache_depth++;
		acpi_ut_release_mutex (ACPI_MTX_CACHES);
	}
}
/******************************************************************************
 *
 * FUNCTION:    Acpi_ut_acquire_from_cache
 *
 * PARAMETERS:  List_id             - Memory list ID
 *
 * RETURN:      A requested object.  NULL if the object could not be
 *              allocated.
 *
 * DESCRIPTION: Get an object from the specified cache.  If cache is empty,
 *              the object is allocated.
 *
 ******************************************************************************/
void *
acpi_ut_acquire_from_cache (
	u32                     list_id)
{
	ACPI_MEMORY_LIST        *cache_info;
	void                    *object;
	PROC_NAME ("Ut_acquire_from_cache");
	cache_info = &acpi_gbl_memory_lists[list_id];
	acpi_ut_acquire_mutex (ACPI_MTX_CACHES);
	ACPI_MEM_TRACKING (cache_info->cache_requests++);
	/* Check the cache first */
	if (cache_info->list_head) {
		/* There is an object available, use it */
		object = cache_info->list_head;
		cache_info->list_head = * (char **) (((char *) object) + cache_info->link_offset);
		ACPI_MEM_TRACKING (cache_info->cache_hits++);
		cache_info->cache_depth--;
#ifdef ACPI_DBG_TRACK_ALLOCATIONS
		ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Object %p from %sn",
			object, acpi_gbl_memory_lists[list_id].list_name));
#endif
		acpi_ut_release_mutex (ACPI_MTX_CACHES);
		/* Clear (zero) the previously used Object */
		MEMSET (object, 0, cache_info->object_size);
	}
	else {
		/* The cache is empty, create a new object */
		/* Avoid deadlock with ACPI_MEM_CALLOCATE */
		acpi_ut_release_mutex (ACPI_MTX_CACHES);
		object = ACPI_MEM_CALLOCATE (cache_info->object_size);
		ACPI_MEM_TRACKING (cache_info->total_allocated++);
	}
	return (object);
}
/******************************************************************************
 *
 * FUNCTION:    Acpi_ut_delete_generic_cache
 *
 * PARAMETERS:  List_id         - Memory list ID
 *
 * RETURN:      None
 *
 * DESCRIPTION: Free all objects within the requested cache.
 *
 ******************************************************************************/
void
acpi_ut_delete_generic_cache (
	u32                     list_id)
{
	ACPI_MEMORY_LIST        *cache_info;
	char                    *next;
	FUNCTION_ENTRY ();
	cache_info = &acpi_gbl_memory_lists[list_id];
	while (cache_info->list_head) {
		/* Delete one cached state object */
		next = * (char **) (((char *) cache_info->list_head) + cache_info->link_offset);
		ACPI_MEM_FREE (cache_info->list_head);
		cache_info->list_head = next;
		cache_info->cache_depth--;
	}
}
#ifdef ACPI_DBG_TRACK_ALLOCATIONS
/*
 * 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_callocate call
 * Acpi_ut_track_allocation to add an element to the list; deletion
 * occurs in the body of Acpi_ut_free.
 */
/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_find_allocation
 *
 * PARAMETERS:  Address             - Address of allocated memory
 *
 * RETURN:      A list element if found; NULL otherwise.
 *
 * DESCRIPTION: Searches for an element in the global allocation tracking list.
 *
 ******************************************************************************/
acpi_debug_mem_block *
acpi_ut_find_allocation (
	u32                     list_id,
	void                    *address)
{
	acpi_debug_mem_block    *element;
	FUNCTION_ENTRY ();
	if (list_id > ACPI_MEM_LIST_MAX) {
		return (NULL);
	}
	element = acpi_gbl_memory_lists[list_id].list_head;
	/* Search for the address. */
	while (element) {
		if (element == address) {
			return (element);
		}
		element = element->next;
	}
	return (NULL);
}
/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_track_allocation
 *
 * PARAMETERS:  Address             - 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:      None.
 *
 * DESCRIPTION: Inserts an element into the global allocation tracking list.
 *
 ******************************************************************************/
acpi_status
acpi_ut_track_allocation (
	u32                     list_id,
	acpi_debug_mem_block    *address,
	u32                     size,
	u8                      alloc_type,
	u32                     component,
	NATIVE_CHAR             *module,
	u32                     line)
{
	ACPI_MEMORY_LIST        *mem_list;
	acpi_debug_mem_block    *element;
	acpi_status             status = AE_OK;
	FUNCTION_TRACE_PTR ("Ut_track_allocation", address);
	if (list_id > ACPI_MEM_LIST_MAX) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}
	mem_list = &acpi_gbl_memory_lists[list_id];
	acpi_ut_acquire_mutex (ACPI_MTX_MEMORY);
	/*
	 * Search list for this address to make sure it is not already on the list.
	 * This will catch several kinds of problems.
	 */
	element = acpi_ut_find_allocation (list_id, address);
	if (element) {
		REPORT_ERROR (("Ut_track_allocation: Address already present in list! (%p)n",
			address));
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Element %p Address %pn", element, address));
		goto unlock_and_exit;
	}
	/* Fill in the instance data. */
	address->size      = size;
	address->alloc_type = alloc_type;
	address->component = component;
	address->line      = line;
	STRNCPY (address->module, module, MAX_MODULE_NAME);
	/* Insert at list head */
	if (mem_list->list_head) {
		((acpi_debug_mem_block *)(mem_list->list_head))->previous = address;
	}
	address->next = mem_list->list_head;
	address->previous = NULL;
	mem_list->list_head = address;
unlock_and_exit:
	acpi_ut_release_mutex (ACPI_MTX_MEMORY);
	return_ACPI_STATUS (status);
}
/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_remove_allocation
 *
 * PARAMETERS:  Address             - Address of allocated memory
 *              Component           - Component type of caller
 *              Module              - Source file name of caller
 *              Line                - Line number of caller
 *
 * RETURN:
 *
 * DESCRIPTION: Deletes an element from the global allocation tracking list.
 *
 ******************************************************************************/
acpi_status
acpi_ut_remove_allocation (
	u32                     list_id,
	acpi_debug_mem_block    *address,
	u32                     component,
	NATIVE_CHAR             *module,
	u32                     line)
{
	ACPI_MEMORY_LIST        *mem_list;
	FUNCTION_TRACE ("Ut_remove_allocation");
	if (list_id > ACPI_MEM_LIST_MAX) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}
	mem_list = &acpi_gbl_memory_lists[list_id];
	if (NULL == mem_list->list_head) {
		/* No allocations! */
		_REPORT_ERROR (module, line, component,
				("Ut_remove_allocation: Empty allocation list, nothing to free!n"));
		return_ACPI_STATUS (AE_OK);
	}
	acpi_ut_acquire_mutex (ACPI_MTX_MEMORY);
	/* Unlink */
	if (address->previous) {
		(address->previous)->next = address->next;
	}
	else {
		mem_list->list_head = address->next;
	}
	if (address->next) {
		(address->next)->previous = address->previous;
	}
	/* Mark the segment as deleted */
	MEMSET (&address->user_space, 0xEA, address->size);
	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Freeing size %Xn", address->size));
	acpi_ut_release_mutex (ACPI_MTX_MEMORY);
	return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_dump_allocation_info
 *
 * PARAMETERS:
 *
 * RETURN:      None
 *
 * DESCRIPTION: Print some info about the outstanding allocations.
 *
 ******************************************************************************/
void
acpi_ut_dump_allocation_info (
	void)
{
/*
	ACPI_MEMORY_LIST        *Mem_list;
*/
	FUNCTION_TRACE ("Ut_dump_allocation_info");
/*
	ACPI_DEBUG_PRINT (TRACE_ALLOCATIONS | TRACE_TABLES,
			  ("%30s: %4d (%3d Kb)n", "Current allocations",
			  Mem_list->Current_count,
			  ROUND_UP_TO_1K (Mem_list->Current_size)));
	ACPI_DEBUG_PRINT (TRACE_ALLOCATIONS | TRACE_TABLES,
			  ("%30s: %4d (%3d 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,
			  ("%30s: %4d (%3d Kb)n", "Total (all) internal objects",
			  Running_object_count,
			  ROUND_UP_TO_1K (Running_object_size)));
	ACPI_DEBUG_PRINT (TRACE_ALLOCATIONS | TRACE_TABLES,
			  ("%30s: %4d (%3d Kb)n", "Total (all) allocations",
			  Running_alloc_count,
			  ROUND_UP_TO_1K (Running_alloc_size)));
	ACPI_DEBUG_PRINT (TRACE_ALLOCATIONS | TRACE_TABLES,
			  ("%30s: %4d (%3d 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,
			  ("%30s: %4d (%3d Kb)n", "Max Nodes",
			  Acpi_gbl_Max_concurrent_node_count,
			  ROUND_UP_TO_1K ((Acpi_gbl_Max_concurrent_node_count * sizeof (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,
	NATIVE_CHAR             *module)
{
	acpi_debug_mem_block    *element;
	u32                     i;
	FUNCTION_TRACE ("Ut_dump_allocations");
	element = acpi_gbl_memory_lists[0].list_head;
	if (element == NULL) {
		ACPI_DEBUG_PRINT ((ACPI_DB_OK,
				"No outstanding allocations.n"));
		return_VOID;
	}
	/*
	 * Walk the allocation list.
	 */
	acpi_ut_acquire_mutex (ACPI_MTX_MEMORY);
	ACPI_DEBUG_PRINT ((ACPI_DB_OK,
		"Outstanding allocations:n"));
	for (i = 1; ; i++)  /* Just a counter */ {
		if ((element->component & component) &&
			((module == NULL) || (0 == STRCMP (module, element->module)))) {
			if (((acpi_operand_object  *)(&element->user_space))->common.type != ACPI_CACHED_OBJECT) {
				ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK,
						 "%p Len %04X %9.9s-%d",
						 &element->user_space, element->size, element->module,
						 element->line));
				/* Most of the elements will be internal objects. */
				switch (((acpi_operand_object  *)
					(&element->user_space))->common.data_type) {
				case ACPI_DESC_TYPE_INTERNAL:
					ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK,
							" Obj_type %12.12s R%d",
							acpi_ut_get_type_name (((acpi_operand_object *)(&element->user_space))->common.type),
							((acpi_operand_object *)(&element->user_space))->common.reference_count));
					break;
				case ACPI_DESC_TYPE_PARSER:
					ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK,
							" Parse_obj Opcode %04X",
							((acpi_parse_object *)(&element->user_space))->opcode));
					break;
				case ACPI_DESC_TYPE_NAMED:
					ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK,
							" Node %4.4s",
							(char*)&((acpi_namespace_node *)(&element->user_space))->name));
					break;
				case ACPI_DESC_TYPE_STATE:
					ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK,
							" Untyped State_obj"));
					break;
				case ACPI_DESC_TYPE_STATE_UPDATE:
					ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK,
							" UPDATE State_obj"));
					break;
				case ACPI_DESC_TYPE_STATE_PACKAGE:
					ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK,
							" PACKAGE State_obj"));
					break;
				case ACPI_DESC_TYPE_STATE_CONTROL:
					ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK,
							" CONTROL State_obj"));
					break;
				case ACPI_DESC_TYPE_STATE_RPSCOPE:
					ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK,
							" ROOT-PARSE-SCOPE State_obj"));
					break;
				case ACPI_DESC_TYPE_STATE_PSCOPE:
					ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK,
							" PARSE-SCOPE State_obj"));
					break;
				case ACPI_DESC_TYPE_STATE_WSCOPE:
					ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK,
							" WALK-SCOPE State_obj"));
					break;
				case ACPI_DESC_TYPE_STATE_RESULT:
					ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK,
							" RESULT State_obj"));
					break;
				case ACPI_DESC_TYPE_STATE_NOTIFY:
					ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK,
							" NOTIFY State_obj"));
					break;
				}
				ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK, "n"));
			}
		}
		if (element->next == NULL) {
			break;
		}
		element = element->next;
	}
	acpi_ut_release_mutex (ACPI_MTX_MEMORY);
	ACPI_DEBUG_PRINT ((ACPI_DB_OK,
		"Total number of unfreed allocations = %d(%X)n", i,i));
	return_VOID;
}
/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_allocate
 *
 * 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 (
	u32                     size,
	u32                     component,
	NATIVE_CHAR             *module,
	u32                     line)
{
	acpi_debug_mem_block    *address;
	acpi_status             status;
	FUNCTION_TRACE_U32 ("Ut_allocate", size);
	/* Check for an inadvertent size of zero bytes */
	if (!size) {
		_REPORT_ERROR (module, line, component,
				("Ut_allocate: Attempt to allocate zero bytesn"));
		size = 1;
	}
	address = acpi_os_allocate (size + sizeof (acpi_debug_mem_block));
	if (!address) {
		/* Report allocation error */
		_REPORT_ERROR (module, line, component,
				("Ut_allocate: Could not allocate size %Xn", size));
		return_PTR (NULL);
	}
	status = acpi_ut_track_allocation (ACPI_MEM_LIST_GLOBAL, address, size,
			  MEM_MALLOC, component, module, line);
	if (ACPI_FAILURE (status)) {
		acpi_os_free (address);
		return_PTR (NULL);
	}
	acpi_gbl_memory_lists[ACPI_MEM_LIST_GLOBAL].total_allocated++;
	acpi_gbl_memory_lists[ACPI_MEM_LIST_GLOBAL].current_total_size += size;
	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "%p Size %Xn", address, size));
	return_PTR ((void *) &address->user_space);
}
/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_callocate
 *
 * 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_callocate (
	u32                     size,
	u32                     component,
	NATIVE_CHAR             *module,
	u32                     line)
{
	acpi_debug_mem_block    *address;
	acpi_status             status;
	FUNCTION_TRACE_U32 ("Ut_callocate", size);
	/* Check for an inadvertent size of zero bytes */
	if (!size) {
		_REPORT_ERROR (module, line, component,
				("Ut_callocate: Attempt to allocate zero bytesn"));
		return_PTR (NULL);
	}
	address = acpi_os_callocate (size + sizeof (acpi_debug_mem_block));
	if (!address) {
		/* Report allocation error */
		_REPORT_ERROR (module, line, component,
				("Ut_callocate: Could not allocate size %Xn", size));
		return_PTR (NULL);
	}
	status = acpi_ut_track_allocation (ACPI_MEM_LIST_GLOBAL, address, size,
			   MEM_CALLOC, component, module, line);
	if (ACPI_FAILURE (status)) {
		acpi_os_free (address);
		return_PTR (NULL);
	}
	acpi_gbl_memory_lists[ACPI_MEM_LIST_GLOBAL].total_allocated++;
	acpi_gbl_memory_lists[ACPI_MEM_LIST_GLOBAL].current_total_size += size;
	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "%p Size %Xn", address, size));
	return_PTR ((void *) &address->user_space);
}
/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_free
 *
 * PARAMETERS:  Address             - 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 Address
 *
 ******************************************************************************/
void
acpi_ut_free (
	void                    *address,
	u32                     component,
	NATIVE_CHAR             *module,
	u32                     line)
{
	acpi_debug_mem_block    *debug_block;
	FUNCTION_TRACE_PTR ("Ut_free", address);
	if (NULL == address) {
		_REPORT_ERROR (module, line, component,
			("Acpi_ut_free: Trying to delete a NULL addressn"));
		return_VOID;
	}
	debug_block = (acpi_debug_mem_block *)
			  (((char *) address) - sizeof (acpi_debug_mem_header));
	acpi_gbl_memory_lists[ACPI_MEM_LIST_GLOBAL].total_freed++;
	acpi_gbl_memory_lists[ACPI_MEM_LIST_GLOBAL].current_total_size -= debug_block->size;
	acpi_ut_remove_allocation (ACPI_MEM_LIST_GLOBAL, debug_block,
			component, module, line);
	acpi_os_free (debug_block);
	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "%p freedn", address));
	return_VOID;
}
#endif  /* #ifdef ACPI_DBG_TRACK_ALLOCATIONS */

						