arch/all-pc/acpica/source/components/utilities/utcache.c

   1 /******************************************************************************
   2  *
   3  * Module Name: utcache - local cache allocation routines
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #define __UTCACHE_C__
  45
  46 #include "acpi.h"
  47 #include "accommon.h"
  48
  49 #define _COMPONENT          ACPI_UTILITIES
  50         ACPI_MODULE_NAME    ("utcache")
  51
  52
  53 #ifdef ACPI_USE_LOCAL_CACHE
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    AcpiOsCreateCache
  57  *
  58  * PARAMETERS:  CacheName       - Ascii name for the cache
  59  *              ObjectSize      - Size of each cached object
  60  *              MaxDepth        - Maximum depth of the cache (in objects)
  61  *              ReturnCache     - Where the new cache object is returned
  62  *
  63  * RETURN:      Status
  64  *
  65  * DESCRIPTION: Create a cache object
  66  *
  67  ******************************************************************************/
  68
  69 ACPI_STATUS
  70 AcpiOsCreateCache (
  71     char                    *CacheName,
  72     UINT16                  ObjectSize,
  73     UINT16                  MaxDepth,
  74     ACPI_MEMORY_LIST        **ReturnCache)
  75 {
  76     ACPI_MEMORY_LIST        *Cache;
  77
  78
  79     ACPI_FUNCTION_ENTRY ();
  80
  81
  82     if (!CacheName || !ReturnCache || (ObjectSize < 16))
  83     {
  84         return (AE_BAD_PARAMETER);
  85     }
  86
  87     /* Create the cache object */
  88
  89     Cache = AcpiOsAllocate (sizeof (ACPI_MEMORY_LIST));
  90     if (!Cache)
  91     {
  92         return (AE_NO_MEMORY);
  93     }
  94
  95     /* Populate the cache object and return it */
  96
  97     ACPI_MEMSET (Cache, 0, sizeof (ACPI_MEMORY_LIST));
  98     Cache->ListName   = CacheName;
  99     Cache->ObjectSize = ObjectSize;
 100     Cache->MaxDepth   = MaxDepth;
 101
 102     *ReturnCache = Cache;
 103     return (AE_OK);
 104 }
 105
 106
 107 /*******************************************************************************
 108  *
 109  * FUNCTION:    AcpiOsPurgeCache
 110  *
 111  * PARAMETERS:  Cache           - Handle to cache object
 112  *
 113  * RETURN:      Status
 114  *
 115  * DESCRIPTION: Free all objects within the requested cache.
 116  *
 117  ******************************************************************************/
 118
 119 ACPI_STATUS
 120 AcpiOsPurgeCache (
 121     ACPI_MEMORY_LIST        *Cache)
 122 {
 123     void                    *Next;
 124     ACPI_STATUS             Status;
 125
 126
 127     ACPI_FUNCTION_ENTRY ();
 128
 129
 130     if (!Cache)
 131     {
 132         return (AE_BAD_PARAMETER);
 133     }
 134
 135     Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES);
 136     if (ACPI_FAILURE (Status))
 137     {
 138         return (Status);
 139     }
 140
 141     /* Walk the list of objects in this cache */
 142
 143     while (Cache->ListHead)
 144     {
 145         /* Delete and unlink one cached state object */
 146
 147         Next = ACPI_GET_DESCRIPTOR_PTR (Cache->ListHead);
 148         ACPI_FREE (Cache->ListHead);
 149
 150         Cache->ListHead = Next;
 151         Cache->CurrentDepth--;
 152     }
 153
 154     (void) AcpiUtReleaseMutex (ACPI_MTX_CACHES);
 155     return (AE_OK);
 156 }
 157
 158
 159 /*******************************************************************************
 160  *
 161  * FUNCTION:    AcpiOsDeleteCache
 162  *
 163  * PARAMETERS:  Cache           - Handle to cache object
 164  *
 165  * RETURN:      Status
 166  *
 167  * DESCRIPTION: Free all objects within the requested cache and delete the
 168  *              cache object.
 169  *
 170  ******************************************************************************/
 171
 172 ACPI_STATUS
 173 AcpiOsDeleteCache (
 174     ACPI_MEMORY_LIST        *Cache)
 175 {
 176     ACPI_STATUS             Status;
 177
 178
 179     ACPI_FUNCTION_ENTRY ();
 180
 181
 182    /* Purge all objects in the cache */
 183
 184     Status = AcpiOsPurgeCache (Cache);
 185     if (ACPI_FAILURE (Status))
 186     {
 187         return (Status);
 188     }
 189
 190     /* Now we can delete the cache object */
 191
 192     AcpiOsFree (Cache);
 193     return (AE_OK);
 194 }
 195
 196
 197 /*******************************************************************************
 198  *
 199  * FUNCTION:    AcpiOsReleaseObject
 200  *
 201  * PARAMETERS:  Cache       - Handle to cache object
 202  *              Object      - The object to be released
 203  *
 204  * RETURN:      None
 205  *
 206  * DESCRIPTION: Release an object to the specified cache. If cache is full,
 207  *              the object is deleted.
 208  *
 209  ******************************************************************************/
 210
 211 ACPI_STATUS
 212 AcpiOsReleaseObject (
 213     ACPI_MEMORY_LIST        *Cache,
 214     void                    *Object)
 215 {
 216     ACPI_STATUS             Status;
 217
 218
 219     ACPI_FUNCTION_ENTRY ();
 220
 221
 222     if (!Cache || !Object)
 223     {
 224         return (AE_BAD_PARAMETER);
 225     }
 226
 227     /* If cache is full, just free this object */
 228
 229     if (Cache->CurrentDepth >= Cache->MaxDepth)
 230     {
 231         ACPI_FREE (Object);
 232         ACPI_MEM_TRACKING (Cache->TotalFreed++);
 233     }
 234
 235     /* Otherwise put this object back into the cache */
 236
 237     else
 238     {
 239         Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES);
 240         if (ACPI_FAILURE (Status))
 241         {
 242             return (Status);
 243         }
 244
 245         /* Mark the object as cached */
 246
 247         ACPI_MEMSET (Object, 0xCA, Cache->ObjectSize);
 248         ACPI_SET_DESCRIPTOR_TYPE (Object, ACPI_DESC_TYPE_CACHED);
 249
 250         /* Put the object at the head of the cache list */
 251
 252         ACPI_SET_DESCRIPTOR_PTR (Object, Cache->ListHead);
 253         Cache->ListHead = Object;
 254         Cache->CurrentDepth++;
 255
 256         (void) AcpiUtReleaseMutex (ACPI_MTX_CACHES);
 257     }
 258
 259     return (AE_OK);
 260 }
 261
 262
 263 /*******************************************************************************
 264  *
 265  * FUNCTION:    AcpiOsAcquireObject
 266  *
 267  * PARAMETERS:  Cache           - Handle to cache object
 268  *
 269  * RETURN:      the acquired object. NULL on error
 270  *
 271  * DESCRIPTION: Get an object from the specified cache. If cache is empty,
 272  *              the object is allocated.
 273  *
 274  ******************************************************************************/
 275
 276 void *
 277 AcpiOsAcquireObject (
 278     ACPI_MEMORY_LIST        *Cache)
 279 {
 280     ACPI_STATUS             Status;
 281     void                    *Object;
 282
 283
 284     ACPI_FUNCTION_NAME (OsAcquireObject);
 285
 286
 287     if (!Cache)
 288     {
 289         return (NULL);
 290     }
 291
 292     Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES);
 293     if (ACPI_FAILURE (Status))
 294     {
 295         return (NULL);
 296     }
 297
 298     ACPI_MEM_TRACKING (Cache->Requests++);
 299
 300     /* Check the cache first */
 301
 302     if (Cache->ListHead)
 303     {
 304         /* There is an object available, use it */
 305
 306         Object = Cache->ListHead;
 307         Cache->ListHead = ACPI_GET_DESCRIPTOR_PTR (Object);
 308
 309         Cache->CurrentDepth--;
 310
 311         ACPI_MEM_TRACKING (Cache->Hits++);
 312         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 313             "Object %p from %s cache\n", Object, Cache->ListName));
 314
 315         Status = AcpiUtReleaseMutex (ACPI_MTX_CACHES);
 316         if (ACPI_FAILURE (Status))
 317         {
 318             return (NULL);
 319         }
 320
 321         /* Clear (zero) the previously used Object */
 322
 323         ACPI_MEMSET (Object, 0, Cache->ObjectSize);
 324     }
 325     else
 326     {
 327         /* The cache is empty, create a new object */
 328
 329         ACPI_MEM_TRACKING (Cache->TotalAllocated++);
 330
 331 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
 332         if ((Cache->TotalAllocated - Cache->TotalFreed) > Cache->MaxOccupied)
 333         {
 334             Cache->MaxOccupied = Cache->TotalAllocated - Cache->TotalFreed;
 335         }
 336 #endif
 337
 338         /* Avoid deadlock with ACPI_ALLOCATE_ZEROED */
 339
 340         Status = AcpiUtReleaseMutex (ACPI_MTX_CACHES);
 341         if (ACPI_FAILURE (Status))
 342         {
 343             return (NULL);
 344         }
 345
 346         Object = ACPI_ALLOCATE_ZEROED (Cache->ObjectSize);
 347         if (!Object)
 348         {
 349             return (NULL);
 350         }
 351     }
 352
 353     return (Object);
 354 }
 355 #endif /* ACPI_USE_LOCAL_CACHE */