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![Erik Schmauss](/assets/img/avatar_default.png)
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
279 lines
6.6 KiB
C
279 lines
6.6 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: utcache - local cache allocation routines
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*
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* Copyright (C) 2000 - 2018, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.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) {
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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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memset(cache, 0, sizeof(struct acpi_memory_list));
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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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void *next;
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acpi_status status;
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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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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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/* 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_GET_DESCRIPTOR_PTR(cache->list_head);
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ACPI_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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(void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
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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 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_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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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_SET_DESCRIPTOR_PTR(object, 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_TRACE(os_acquire_object);
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if (!cache) {
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return_PTR(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_PTR(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_GET_DESCRIPTOR_PTR(object);
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cache->current_depth--;
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ACPI_MEM_TRACKING(cache->hits++);
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ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC,
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"%s: Object %p from %s cache\n",
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ACPI_GET_FUNCTION_NAME, object,
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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_PTR(NULL);
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}
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/* Clear (zero) the previously used Object */
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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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#ifdef ACPI_DBG_TRACK_ALLOCATIONS
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if ((cache->total_allocated - cache->total_freed) >
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cache->max_occupied) {
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cache->max_occupied =
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cache->total_allocated - cache->total_freed;
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}
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#endif
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/* Avoid deadlock with ACPI_ALLOCATE_ZEROED */
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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_PTR(NULL);
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}
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object = ACPI_ALLOCATE_ZEROED(cache->object_size);
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if (!object) {
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return_PTR(NULL);
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}
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}
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return_PTR(object);
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}
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#endif /* ACPI_USE_LOCAL_CACHE */
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