+++ /dev/null
-/******************************************************************************
- *
- * Module Name: utcache - local cache allocation routines
- *
- *****************************************************************************/
-
-/*
- * Copyright (C) 2000 - 2008, Intel Corp.
- * 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/accommon.h>
-
-#define _COMPONENT ACPI_UTILITIES
-ACPI_MODULE_NAME("utcache")
-#ifdef ACPI_USE_LOCAL_CACHE
-/*******************************************************************************
- *
- * FUNCTION: acpi_os_create_cache
- *
- * PARAMETERS: cache_name - Ascii name for the cache
- * object_size - Size of each cached object
- * max_depth - Maximum depth of the cache (in objects)
- * return_cache - Where the new cache object is returned
- *
- * RETURN: Status
- *
- * DESCRIPTION: Create a cache object
- *
- ******************************************************************************/
-acpi_status
-acpi_os_create_cache(char *cache_name,
- u16 object_size,
- u16 max_depth, struct acpi_memory_list ** return_cache)
-{
- struct acpi_memory_list *cache;
-
- ACPI_FUNCTION_ENTRY();
-
- if (!cache_name || !return_cache || (object_size < 16)) {
- return (AE_BAD_PARAMETER);
- }
-
- /* Create the cache object */
-
- cache = acpi_os_allocate(sizeof(struct acpi_memory_list));
- if (!cache) {
- return (AE_NO_MEMORY);
- }
-
- /* Populate the cache object and return it */
-
- ACPI_MEMSET(cache, 0, sizeof(struct acpi_memory_list));
- cache->link_offset = 8;
- cache->list_name = cache_name;
- cache->object_size = object_size;
- cache->max_depth = max_depth;
-
- *return_cache = cache;
- return (AE_OK);
-}
-
-/*******************************************************************************
- *
- * FUNCTION: acpi_os_purge_cache
- *
- * PARAMETERS: Cache - Handle to cache object
- *
- * RETURN: Status
- *
- * DESCRIPTION: Free all objects within the requested cache.
- *
- ******************************************************************************/
-
-acpi_status acpi_os_purge_cache(struct acpi_memory_list * cache)
-{
- char *next;
-
- ACPI_FUNCTION_ENTRY();
-
- if (!cache) {
- return (AE_BAD_PARAMETER);
- }
-
- /* Walk the list of objects in this cache */
-
- while (cache->list_head) {
-
- /* Delete and unlink one cached state object */
-
- next = *(ACPI_CAST_INDIRECT_PTR(char,
- &(((char *)cache->
- list_head)[cache->
- link_offset])));
- ACPI_FREE(cache->list_head);
-
- cache->list_head = next;
- cache->current_depth--;
- }
-
- return (AE_OK);
-}
-
-/*******************************************************************************
- *
- * FUNCTION: acpi_os_delete_cache
- *
- * PARAMETERS: Cache - Handle to cache object
- *
- * RETURN: Status
- *
- * DESCRIPTION: Free all objects within the requested cache and delete the
- * cache object.
- *
- ******************************************************************************/
-
-acpi_status acpi_os_delete_cache(struct acpi_memory_list * cache)
-{
- acpi_status status;
-
- ACPI_FUNCTION_ENTRY();
-
- /* Purge all objects in the cache */
-
- status = acpi_os_purge_cache(cache);
- if (ACPI_FAILURE(status)) {
- return (status);
- }
-
- /* Now we can delete the cache object */
-
- ACPI_FREE(cache);
- return (AE_OK);
-}
-
-/*******************************************************************************
- *
- * FUNCTION: acpi_os_release_object
- *
- * PARAMETERS: Cache - Handle to cache object
- * Object - The object to be released
- *
- * RETURN: None
- *
- * DESCRIPTION: Release an object to the specified cache. If cache is full,
- * the object is deleted.
- *
- ******************************************************************************/
-
-acpi_status
-acpi_os_release_object(struct acpi_memory_list * cache, void *object)
-{
- acpi_status status;
-
- ACPI_FUNCTION_ENTRY();
-
- if (!cache || !object) {
- return (AE_BAD_PARAMETER);
- }
-
- /* If cache is full, just free this object */
-
- if (cache->current_depth >= cache->max_depth) {
- ACPI_FREE(object);
- ACPI_MEM_TRACKING(cache->total_freed++);
- }
-
- /* Otherwise put this object back into the cache */
-
- else {
- status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
- if (ACPI_FAILURE(status)) {
- return (status);
- }
-
- /* Mark the object as cached */
-
- ACPI_MEMSET(object, 0xCA, cache->object_size);
- ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_CACHED);
-
- /* Put the object at the head of the cache list */
-
- *(ACPI_CAST_INDIRECT_PTR(char,
- &(((char *)object)[cache->
- link_offset]))) =
- cache->list_head;
- cache->list_head = object;
- cache->current_depth++;
-
- (void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
- }
-
- return (AE_OK);
-}
-
-/*******************************************************************************
- *
- * FUNCTION: acpi_os_acquire_object
- *
- * PARAMETERS: Cache - Handle to cache object
- *
- * RETURN: the acquired object. NULL on error
- *
- * DESCRIPTION: Get an object from the specified cache. If cache is empty,
- * the object is allocated.
- *
- ******************************************************************************/
-
-void *acpi_os_acquire_object(struct acpi_memory_list *cache)
-{
- acpi_status status;
- void *object;
-
- ACPI_FUNCTION_NAME(os_acquire_object);
-
- if (!cache) {
- return (NULL);
- }
-
- status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
- if (ACPI_FAILURE(status)) {
- return (NULL);
- }
-
- ACPI_MEM_TRACKING(cache->requests++);
-
- /* Check the cache first */
-
- if (cache->list_head) {
-
- /* There is an object available, use it */
-
- object = cache->list_head;
- cache->list_head = *(ACPI_CAST_INDIRECT_PTR(char,
- &(((char *)
- object)[cache->
- link_offset])));
-
- cache->current_depth--;
-
- ACPI_MEM_TRACKING(cache->hits++);
- ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
- "Object %p from %s cache\n", object,
- cache->list_name));
-
- status = acpi_ut_release_mutex(ACPI_MTX_CACHES);
- if (ACPI_FAILURE(status)) {
- return (NULL);
- }
-
- /* Clear (zero) the previously used Object */
-
- ACPI_MEMSET(object, 0, cache->object_size);
- } else {
- /* The cache is empty, create a new object */
-
- ACPI_MEM_TRACKING(cache->total_allocated++);
-
-#ifdef ACPI_DBG_TRACK_ALLOCATIONS
- if ((cache->total_allocated - cache->total_freed) >
- cache->max_occupied) {
- cache->max_occupied =
- cache->total_allocated - cache->total_freed;
- }
-#endif
-
- /* Avoid deadlock with ACPI_ALLOCATE_ZEROED */
-
- status = acpi_ut_release_mutex(ACPI_MTX_CACHES);
- if (ACPI_FAILURE(status)) {
- return (NULL);
- }
-
- object = ACPI_ALLOCATE_ZEROED(cache->object_size);
- if (!object) {
- return (NULL);
- }
- }
-
- return (object);
-}
-#endif /* ACPI_USE_LOCAL_CACHE */
git.openpandora.org / pandora-kernel.git / commitdiff