drivers/gpu/drm/ttm/ttm_bo_manager.c

   1 /**************************************************************************
   2  *
   3  * Copyright (c) 2007-2010 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 <drm/ttm/ttm_module.h>
  32 #include <drm/ttm/ttm_bo_driver.h>
  33 #include <drm/ttm/ttm_placement.h>
  34 #include <drm/drm_mm.h>
  35 #include <linux/slab.h>
  36 #include <linux/spinlock.h>
  37 #include <linux/module.h>
  38
  39 /**
  40  * Currently we use a spinlock for the lock, but a mutex *may* be
  41  * more appropriate to reduce scheduling latency if the range manager
  42  * ends up with very fragmented allocation patterns.
  43  */
  44
  45 struct ttm_range_manager {
  46         struct drm_mm mm;
  47         spinlock_t lock;
  48 };
  49
  50 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
  51                                struct ttm_buffer_object *bo,
  52                                const struct ttm_place *place,
  53                                struct ttm_mem_reg *mem)
  54 {
  55         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  56         struct drm_mm *mm = &rman->mm;
  57         struct drm_mm_node *node = NULL;
  58         enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
  59         unsigned long lpfn;
  60         int ret;
  61
  62         lpfn = place->lpfn;
  63         if (!lpfn)
  64                 lpfn = man->size;
  65
  66         node = kzalloc(sizeof(*node), GFP_KERNEL);
  67         if (!node)
  68                 return -ENOMEM;
  69
  70         if (place->flags & TTM_PL_FLAG_TOPDOWN)
  71                 aflags = DRM_MM_CREATE_TOP;
  72
  73         spin_lock(&rman->lock);
  74         ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages,
  75                                           mem->page_alignment, 0,
  76                                           place->fpfn, lpfn,
  77                                           DRM_MM_SEARCH_BEST,
  78                                           aflags);
  79         spin_unlock(&rman->lock);
  80
  81         if (unlikely(ret)) {
  82                 kfree(node);
  83         } else {
  84                 mem->mm_node = node;
  85                 mem->start = node->start;
  86         }
  87
  88         return 0;
  89 }
  90
  91 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
  92                                 struct ttm_mem_reg *mem)
  93 {
  94         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  95
  96         if (mem->mm_node) {
  97                 spin_lock(&rman->lock);
  98                 drm_mm_remove_node(mem->mm_node);
  99                 spin_unlock(&rman->lock);
 100
 101                 kfree(mem->mm_node);
 102                 mem->mm_node = NULL;
 103         }
 104 }
 105
 106 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
 107                            unsigned long p_size)
 108 {
 109         struct ttm_range_manager *rman;
 110
 111         rman = kzalloc(sizeof(*rman), GFP_KERNEL);
 112         if (!rman)
 113                 return -ENOMEM;
 114
 115         drm_mm_init(&rman->mm, 0, p_size);
 116         spin_lock_init(&rman->lock);
 117         man->priv = rman;
 118         return 0;
 119 }
 120
 121 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
 122 {
 123         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
 124         struct drm_mm *mm = &rman->mm;
 125
 126         spin_lock(&rman->lock);
 127         if (drm_mm_clean(mm)) {
 128                 drm_mm_takedown(mm);
 129                 spin_unlock(&rman->lock);
 130                 kfree(rman);
 131                 man->priv = NULL;
 132                 return 0;
 133         }
 134         spin_unlock(&rman->lock);
 135         return -EBUSY;
 136 }
 137
 138 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
 139                              const char *prefix)
 140 {
 141         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
 142
 143         spin_lock(&rman->lock);
 144         drm_mm_debug_table(&rman->mm, prefix);
 145         spin_unlock(&rman->lock);
 146 }
 147
 148 const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
 149         ttm_bo_man_init,
 150         ttm_bo_man_takedown,
 151         ttm_bo_man_get_node,
 152         ttm_bo_man_put_node,
 153         ttm_bo_man_debug
 154 };
 155 EXPORT_SYMBOL(ttm_bo_manager_func);