Line data    Source code

       1             : /* SPDX-License-Identifier: GPL-2.0 OR MIT */
       2             : /**************************************************************************
       3             :  *
       4             :  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
       5             :  * All Rights Reserved.
       6             :  *
       7             :  * Permission is hereby granted, free of charge, to any person obtaining a
       8             :  * copy of this software and associated documentation files (the
       9             :  * "Software"), to deal in the Software without restriction, including
      10             :  * without limitation the rights to use, copy, modify, merge, publish,
      11             :  * distribute, sub license, and/or sell copies of the Software, and to
      12             :  * permit persons to whom the Software is furnished to do so, subject to
      13             :  * the following conditions:
      14             :  *
      15             :  * The above copyright notice and this permission notice (including the
      16             :  * next paragraph) shall be included in all copies or substantial portions
      17             :  * of the Software.
      18             :  *
      19             :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      20             :  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      21             :  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
      22             :  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
      23             :  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
      24             :  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
      25             :  * USE OR OTHER DEALINGS IN THE SOFTWARE.
      26             :  *
      27             :  **************************************************************************/
      28             : /*
      29             :  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
      30             :  *          Jerome Glisse
      31             :  */
      32             : #include <linux/module.h>
      33             : #include <linux/device.h>
      34             : #include <linux/pgtable.h>
      35             : #include <linux/sched.h>
      36             : #include <linux/debugfs.h>
      37             : #include <drm/drm_sysfs.h>
      38             : #include <drm/ttm/ttm_caching.h>
      39             : 
      40             : #include "ttm_module.h"
      41             : 
      42             : /**
      43             :  * DOC: TTM
      44             :  *
      45             :  * TTM is a memory manager for accelerator devices with dedicated memory.
      46             :  *
      47             :  * The basic idea is that resources are grouped together in buffer objects of
      48             :  * certain size and TTM handles lifetime, movement and CPU mappings of those
      49             :  * objects.
      50             :  *
      51             :  * TODO: Add more design background and information here.
      52             :  */
      53             : 
      54             : /**
      55             :  * ttm_prot_from_caching - Modify the page protection according to the
      56             :  * ttm cacing mode
      57             :  * @caching: The ttm caching mode
      58             :  * @tmp: The original page protection
      59             :  *
      60             :  * Return: The modified page protection
      61             :  */
      62           0 : pgprot_t ttm_prot_from_caching(enum ttm_caching caching, pgprot_t tmp)
      63             : {
      64             :         /* Cached mappings need no adjustment */
      65           0 :         if (caching == ttm_cached)
      66           0 :                 return tmp;
      67             : 
      68             : #if defined(__i386__) || defined(__x86_64__)
      69             :         if (caching == ttm_write_combined)
      70             :                 tmp = pgprot_writecombine(tmp);
      71             : #ifndef CONFIG_UML
      72             :         else if (boot_cpu_data.x86 > 3)
      73             :                 tmp = pgprot_noncached(tmp);
      74             : #endif /* CONFIG_UML */
      75             : #endif /* __i386__ || __x86_64__ */
      76             : #if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
      77             :         defined(__powerpc__) || defined(__mips__)
      78             :         if (caching == ttm_write_combined)
      79             :                 tmp = pgprot_writecombine(tmp);
      80             :         else
      81             :                 tmp = pgprot_noncached(tmp);
      82             : #endif
      83             : #if defined(__sparc__)
      84             :         tmp = pgprot_noncached(tmp);
      85             : #endif
      86           0 :         return tmp;
      87             : }
      88             : 
      89             : MODULE_AUTHOR("Thomas Hellstrom, Jerome Glisse");
      90             : MODULE_DESCRIPTION("TTM memory manager subsystem (for DRM device)");
      91             : MODULE_LICENSE("GPL and additional rights");