305 lines
8.1 KiB
C
305 lines
8.1 KiB
C
/******************************************************************************
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*
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* Module Name: utcache - local cache allocation routines
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2005, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#define _COMPONENT ACPI_UTILITIES
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ACPI_MODULE_NAME("utcache")
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#ifdef ACPI_USE_LOCAL_CACHE
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/*******************************************************************************
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*
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* FUNCTION: acpi_os_create_cache
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*
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* PARAMETERS: cache_name - Ascii name for the cache
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* object_size - Size of each cached object
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* max_depth - Maximum depth of the cache (in objects)
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* return_cache - Where the new cache object is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Create a cache object
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*
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******************************************************************************/
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acpi_status
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acpi_os_create_cache(char *cache_name,
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u16 object_size,
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u16 max_depth, struct acpi_memory_list **return_cache)
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{
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struct acpi_memory_list *cache;
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ACPI_FUNCTION_ENTRY();
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if (!cache_name || !return_cache || (object_size < 16)) {
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return (AE_BAD_PARAMETER);
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}
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/* Create the cache object */
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cache = acpi_os_allocate(sizeof(struct acpi_memory_list));
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if (!cache) {
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return (AE_NO_MEMORY);
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}
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/* Populate the cache object and return it */
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ACPI_MEMSET(cache, 0, sizeof(struct acpi_memory_list));
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cache->link_offset = 8;
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cache->list_name = cache_name;
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cache->object_size = object_size;
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cache->max_depth = max_depth;
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*return_cache = cache;
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_os_purge_cache
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*
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* PARAMETERS: Cache - Handle to cache object
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*
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* RETURN: Status
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*
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* DESCRIPTION: Free all objects within the requested cache.
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*
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******************************************************************************/
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acpi_status acpi_os_purge_cache(struct acpi_memory_list * cache)
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{
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char *next;
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ACPI_FUNCTION_ENTRY();
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if (!cache) {
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return (AE_BAD_PARAMETER);
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}
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/* Walk the list of objects in this cache */
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while (cache->list_head) {
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/* Delete and unlink one cached state object */
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next = *(ACPI_CAST_INDIRECT_PTR(char,
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&(((char *)cache->
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list_head)[cache->
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link_offset])));
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ACPI_MEM_FREE(cache->list_head);
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cache->list_head = next;
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cache->current_depth--;
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}
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_os_delete_cache
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*
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* PARAMETERS: Cache - Handle to cache object
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*
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* RETURN: Status
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*
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* DESCRIPTION: Free all objects within the requested cache and delete the
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* cache object.
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*
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******************************************************************************/
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acpi_status acpi_os_delete_cache(struct acpi_memory_list * cache)
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{
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acpi_status status;
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ACPI_FUNCTION_ENTRY();
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/* Purge all objects in the cache */
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status = acpi_os_purge_cache(cache);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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/* Now we can delete the cache object */
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acpi_os_free(cache);
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_os_release_object
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*
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* PARAMETERS: Cache - Handle to cache object
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* Object - The object to be released
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*
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* RETURN: None
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*
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* DESCRIPTION: Release an object to the specified cache. If cache is full,
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* the object is deleted.
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*
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******************************************************************************/
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acpi_status
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acpi_os_release_object(struct acpi_memory_list * cache, void *object)
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{
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acpi_status status;
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ACPI_FUNCTION_ENTRY();
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if (!cache || !object) {
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return (AE_BAD_PARAMETER);
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}
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/* If cache is full, just free this object */
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if (cache->current_depth >= cache->max_depth) {
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ACPI_MEM_FREE(object);
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ACPI_MEM_TRACKING(cache->total_freed++);
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}
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/* Otherwise put this object back into the cache */
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else {
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status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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/* Mark the object as cached */
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ACPI_MEMSET(object, 0xCA, cache->object_size);
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ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_CACHED);
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/* Put the object at the head of the cache list */
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*(ACPI_CAST_INDIRECT_PTR(char,
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&(((char *)object)[cache->
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link_offset]))) =
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cache->list_head;
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cache->list_head = object;
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cache->current_depth++;
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(void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
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}
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_os_acquire_object
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*
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* PARAMETERS: Cache - Handle to cache object
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*
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* RETURN: the acquired object. NULL on error
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*
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* DESCRIPTION: Get an object from the specified cache. If cache is empty,
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* the object is allocated.
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*
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******************************************************************************/
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void *acpi_os_acquire_object(struct acpi_memory_list *cache)
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{
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acpi_status status;
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void *object;
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ACPI_FUNCTION_NAME("os_acquire_object");
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if (!cache) {
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return (NULL);
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}
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status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
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if (ACPI_FAILURE(status)) {
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return (NULL);
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}
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ACPI_MEM_TRACKING(cache->requests++);
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/* Check the cache first */
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if (cache->list_head) {
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/* There is an object available, use it */
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object = cache->list_head;
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cache->list_head = *(ACPI_CAST_INDIRECT_PTR(char,
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&(((char *)
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object)[cache->
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link_offset])));
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cache->current_depth--;
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ACPI_MEM_TRACKING(cache->hits++);
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ACPI_MEM_TRACKING(ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Object %p from %s cache\n",
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object, cache->list_name)));
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status = acpi_ut_release_mutex(ACPI_MTX_CACHES);
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if (ACPI_FAILURE(status)) {
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return (NULL);
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}
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/* Clear (zero) the previously used Object */
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ACPI_MEMSET(object, 0, cache->object_size);
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} else {
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/* The cache is empty, create a new object */
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ACPI_MEM_TRACKING(cache->total_allocated++);
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/* Avoid deadlock with ACPI_MEM_CALLOCATE */
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status = acpi_ut_release_mutex(ACPI_MTX_CACHES);
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if (ACPI_FAILURE(status)) {
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return (NULL);
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}
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object = ACPI_MEM_CALLOCATE(cache->object_size);
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if (!object) {
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return (NULL);
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}
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}
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return (object);
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}
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#endif /* ACPI_USE_LOCAL_CACHE */
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