1 files changed, 322 insertions, 0 deletions

diff --git a/drivers/acpi/utilities/utcache.c b/drivers/acpi/utilities/utcache.c
new file mode 100644
index 000000000000..07588812e72d
--- /dev/null
+++ b/drivers/acpi/utilities/utcache.c
@@ -0,0 +1,322 @@
+/******************************************************************************
+ *
+ * Module Name: utcache - local cache allocation routines
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2005, R. Byron Moore
+ * 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>
+
+#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;
+
+
+        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_MEM_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;
+
+
+        /* 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_MEM_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 ("ut_acquire_from_cache");
+
+
+        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_MEM_TRACKING (ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
+                        "Object %p from %s\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++);
+
+                /* Avoid deadlock with ACPI_MEM_CALLOCATE */
+
+                status = acpi_ut_release_mutex (ACPI_MTX_CACHES);
+                if (ACPI_FAILURE (status)) {
+                        return (NULL);
+                }
+
+                object = ACPI_MEM_CALLOCATE (cache->object_size);
+                if (!object) {
+                        return (NULL);
+                }
+        }
+
+        return (object);
+}
+#endif /* ACPI_USE_LOCAL_CACHE */
+
+