drivers/gpu/drm/ttm/ttm_bo_manager.c

   1 /**************************************************************************
   2  *
   3  * Copyright (c) 2007-2009 VMware, Inc., Palo Alto, CA., USA
   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  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  */
  30
  31 #include "ttm/ttm_module.h"
  32 #include "ttm/ttm_bo_driver.h"
  33 #include "ttm/ttm_placement.h"
  34 #include <linux/jiffies.h>
  35 #include <linux/slab.h>
  36 #include <linux/sched.h>
  37 #include <linux/mm.h>
  38 #include <linux/file.h>
  39 #include <linux/module.h>
  40
  41 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
  42                                struct ttm_buffer_object *bo,
  43                                struct ttm_placement *placement,
  44                                struct ttm_mem_reg *mem)
  45 {
  46         struct ttm_bo_global *glob = man->bdev->glob;
  47         struct drm_mm *mm = man->priv;
  48         struct drm_mm_node *node = NULL;
  49         unsigned long lpfn;
  50         int ret;
  51
  52         lpfn = placement->lpfn;
  53         if (!lpfn)
  54                 lpfn = man->size;
  55         do {
  56                 ret = drm_mm_pre_get(mm);
  57                 if (unlikely(ret))
  58                         return ret;
  59
  60                 spin_lock(&glob->lru_lock);
  61                 node = drm_mm_search_free_in_range(mm,
  62                                         mem->num_pages, mem->page_alignment,
  63                                         placement->fpfn, lpfn, 1);
  64                 if (unlikely(node == NULL)) {
  65                         spin_unlock(&glob->lru_lock);
  66                         return 0;
  67                 }
  68                 node = drm_mm_get_block_atomic_range(node, mem->num_pages,
  69                                                         mem->page_alignment,
  70                                                         placement->fpfn,
  71                                                         lpfn);
  72                 spin_unlock(&glob->lru_lock);
  73         } while (node == NULL);
  74
  75         mem->mm_node = node;
  76         mem->start = node->start;
  77         return 0;
  78 }
  79
  80 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
  81                                 struct ttm_mem_reg *mem)
  82 {
  83         struct ttm_bo_global *glob = man->bdev->glob;
  84
  85         if (mem->mm_node) {
  86                 spin_lock(&glob->lru_lock);
  87                 drm_mm_put_block(mem->mm_node);
  88                 spin_unlock(&glob->lru_lock);
  89                 mem->mm_node = NULL;
  90         }
  91 }
  92
  93 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
  94                            unsigned long p_size)
  95 {
  96         struct drm_mm *mm;
  97         int ret;
  98
  99         mm = kzalloc(sizeof(*mm), GFP_KERNEL);
 100         if (!mm)
 101                 return -ENOMEM;
 102
 103         ret = drm_mm_init(mm, 0, p_size);
 104         if (ret) {
 105                 kfree(mm);
 106                 return ret;
 107         }
 108
 109         man->priv = mm;
 110         return 0;
 111 }
 112
 113 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
 114 {
 115         struct ttm_bo_global *glob = man->bdev->glob;
 116         struct drm_mm *mm = man->priv;
 117         int ret = 0;
 118
 119         spin_lock(&glob->lru_lock);
 120         if (drm_mm_clean(mm)) {
 121                 drm_mm_takedown(mm);
 122                 kfree(mm);
 123                 man->priv = NULL;
 124         } else
 125                 ret = -EBUSY;
 126         spin_unlock(&glob->lru_lock);
 127         return ret;
 128 }
 129
 130 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
 131                              const char *prefix)
 132 {
 133         struct ttm_bo_global *glob = man->bdev->glob;
 134         struct drm_mm *mm = man->priv;
 135
 136         spin_lock(&glob->lru_lock);
 137         drm_mm_debug_table(mm, prefix);
 138         spin_unlock(&glob->lru_lock);
 139 }
 140
 141 const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
 142         ttm_bo_man_init,
 143         ttm_bo_man_takedown,
 144         ttm_bo_man_get_node,
 145         ttm_bo_man_put_node,
 146         ttm_bo_man_debug
 147 };
 148 EXPORT_SYMBOL(ttm_bo_manager_func);