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279 lines
6.6 KiB
279 lines
6.6 KiB
// 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 - 2021, 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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