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,
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  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                                struct ttm_placement *placement,
  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         unsigned long lpfn;
  59         int ret;
  60
  61         lpfn = placement->lpfn;
  62         if (!lpfn)
  63                 lpfn = man->size;
  64
  65         node = kzalloc(sizeof(*node), GFP_KERNEL);
  66         if (!node)
  67                 return -ENOMEM;
  68
  69         spin_lock(&rman->lock);
  70         ret = drm_mm_insert_node_in_range(mm, node, mem->num_pages,
  71                                           mem->page_alignment,
  72                                           placement->fpfn, lpfn,
  73                                           DRM_MM_SEARCH_BEST);
  74         spin_unlock(&rman->lock);
  75
  76         if (unlikely(ret)) {
  77                 kfree(node);
  78         } else {
  79                 mem->mm_node = node;
  80                 mem->start = node->start;
  81         }
  82
  83         return 0;
  84 }
  85
  86 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
  87                                 struct ttm_mem_reg *mem)
  88 {
  89         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  90
  91         if (mem->mm_node) {
  92                 spin_lock(&rman->lock);
  93                 drm_mm_remove_node(mem->mm_node);
  94                 spin_unlock(&rman->lock);
  95
  96                 kfree(mem->mm_node);
  97                 mem->mm_node = NULL;
  98         }
  99 }
 100
 101 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
 102                            unsigned long p_size)
 103 {
 104         struct ttm_range_manager *rman;
 105
 106         rman = kzalloc(sizeof(*rman), GFP_KERNEL);
 107         if (!rman)
 108                 return -ENOMEM;
 109
 110         drm_mm_init(&rman->mm, 0, p_size);
 111         spin_lock_init(&rman->lock);
 112         man->priv = rman;
 113         return 0;
 114 }
 115
 116 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
 117 {
 118         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
 119         struct drm_mm *mm = &rman->mm;
 120
 121         spin_lock(&rman->lock);
 122         if (drm_mm_clean(mm)) {
 123                 drm_mm_takedown(mm);
 124                 spin_unlock(&rman->lock);
 125                 kfree(rman);
 126                 man->priv = NULL;
 127                 return 0;
 128         }
 129         spin_unlock(&rman->lock);
 130         return -EBUSY;
 131 }
 132
 133 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
 134                              const char *prefix)
 135 {
 136         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
 137
 138         spin_lock(&rman->lock);
 139         drm_mm_debug_table(&rman->mm, prefix);
 140         spin_unlock(&rman->lock);
 141 }
 142
 143 const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
 144         ttm_bo_man_init,
 145         ttm_bo_man_takedown,
 146         ttm_bo_man_get_node,
 147         ttm_bo_man_put_node,
 148         ttm_bo_man_debug
 149 };
 150 EXPORT_SYMBOL(ttm_bo_manager_func);