include/drm/drm_cache.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 Red Hat Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  *
  27  **************************************************************************/
  28 /*
  29  * Authors:
  30  * Dave Airlie <airlied@redhat.com>
  31  */
  32
  33 #ifndef _DRM_CACHE_H_
  34 #define _DRM_CACHE_H_
  35
  36 #include <linux/scatterlist.h>
  37
  38 void drm_clflush_pages(struct page *pages[], unsigned long num_pages);
  39 void drm_clflush_sg(struct sg_table *st);
  40 void drm_clflush_virt_range(void *addr, unsigned long length);
  41 u64 drm_get_max_iomem(void);
  42
  43
  44 static inline bool drm_arch_can_wc_memory(void)
  45 {
  46 #if defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE)
  47         return false;
  48 #elif defined(CONFIG_MIPS) && defined(CONFIG_CPU_LOONGSON3)
  49         return false;
  50 #else
  51         return true;
  52 #endif
  53 }
  54
  55 #endif