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Diffstat (limited to 'drivers/acpi/acpica/utcache.c')
| -rw-r--r-- | drivers/acpi/acpica/utcache.c | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/utcache.c b/drivers/acpi/acpica/utcache.c new file mode 100644 index 0000000..1e5d4ae --- /dev/null +++ b/drivers/acpi/acpica/utcache.c @@ -0,0 +1,278 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: utcache - local cache allocation routines + * + * Copyright (C) 2000 - 2022, Intel Corp. + * + *****************************************************************************/ + +#include <acpi/acpi.h> +#include "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) { + 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 */ + + memset(cache, 0, sizeof(struct acpi_memory_list)); + 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) +{ + void *next; + acpi_status status; + + ACPI_FUNCTION_ENTRY(); + + if (!cache) { + return (AE_BAD_PARAMETER); + } + + status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES); + if (ACPI_FAILURE(status)) { + return (status); + } + + /* Walk the list of objects in this cache */ + + while (cache->list_head) { + + /* Delete and unlink one cached state object */ + + next = ACPI_GET_DESCRIPTOR_PTR(cache->list_head); + ACPI_FREE(cache->list_head); + + cache->list_head = next; + cache->current_depth--; + } + + (void)acpi_ut_release_mutex(ACPI_MTX_CACHES); + 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_os_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 */ + + 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_SET_DESCRIPTOR_PTR(object, 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_TRACE(os_acquire_object); + + if (!cache) { + return_PTR(NULL); + } + + status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES); + if (ACPI_FAILURE(status)) { + return_PTR(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_GET_DESCRIPTOR_PTR(object); + + cache->current_depth--; + + ACPI_MEM_TRACKING(cache->hits++); + ACPI_DEBUG_PRINT_RAW((ACPI_DB_EXEC, + "%s: Object %p from %s cache\n", + ACPI_GET_FUNCTION_NAME, object, + cache->list_name)); + + status = acpi_ut_release_mutex(ACPI_MTX_CACHES); + if (ACPI_FAILURE(status)) { + return_PTR(NULL); + } + + /* Clear (zero) the previously used Object */ + + 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_PTR(NULL); + } + + object = ACPI_ALLOCATE_ZEROED(cache->object_size); + if (!object) { + return_PTR(NULL); + } + } + + return_PTR(object); +} +#endif /* ACPI_USE_LOCAL_CACHE */ |