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Rev | Author | Line No. | Line |
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4075 | Serge | 1 | /************************************************************************** |
2 | * |
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3 | * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA |
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4 | * All Rights Reserved. |
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5 | * |
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6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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7 | * copy of this software and associated documentation files (the |
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8 | * "Software"), to deal in the Software without restriction, including |
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9 | * without limitation the rights to use, copy, modify, merge, publish, |
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10 | * distribute, sub license, and/or sell copies of the Software, and to |
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11 | * permit persons to whom the Software is furnished to do so, subject to |
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12 | * the following conditions: |
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13 | * |
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14 | * The above copyright notice and this permission notice (including the |
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15 | * next paragraph) shall be included in all copies or substantial portions |
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16 | * of the Software. |
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17 | * |
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18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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20 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
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21 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, |
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22 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
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23 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
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24 | * USE OR OTHER DEALINGS IN THE SOFTWARE. |
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25 | * |
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26 | **************************************************************************/ |
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27 | /* |
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28 | * Authors: Thomas Hellstrom |
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29 | */ |
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30 | |||
31 | #include |
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32 | #include |
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33 | #include |
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34 | #include |
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35 | #include |
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36 | #include |
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37 | #include |
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38 | |||
39 | /** |
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40 | * Currently we use a spinlock for the lock, but a mutex *may* be |
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41 | * more appropriate to reduce scheduling latency if the range manager |
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42 | * ends up with very fragmented allocation patterns. |
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43 | */ |
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44 | |||
45 | struct ttm_range_manager { |
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46 | struct drm_mm mm; |
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47 | spinlock_t lock; |
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48 | }; |
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49 | |||
50 | static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man, |
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51 | struct ttm_buffer_object *bo, |
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5271 | serge | 52 | const struct ttm_place *place, |
4075 | Serge | 53 | struct ttm_mem_reg *mem) |
54 | { |
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55 | struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; |
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56 | struct drm_mm *mm = &rman->mm; |
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57 | struct drm_mm_node *node = NULL; |
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5271 | serge | 58 | enum drm_mm_search_flags sflags = DRM_MM_SEARCH_BEST; |
5078 | serge | 59 | enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT; |
4075 | Serge | 60 | unsigned long lpfn; |
61 | int ret; |
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62 | |||
5271 | serge | 63 | lpfn = place->lpfn; |
4075 | Serge | 64 | if (!lpfn) |
65 | lpfn = man->size; |
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66 | |||
4112 | Serge | 67 | node = kzalloc(sizeof(*node), GFP_KERNEL); |
68 | if (!node) |
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69 | return -ENOMEM; |
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70 | |||
5271 | serge | 71 | if (place->flags & TTM_PL_FLAG_TOPDOWN) { |
72 | sflags = DRM_MM_SEARCH_BELOW; |
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5078 | serge | 73 | aflags = DRM_MM_CREATE_TOP; |
5271 | serge | 74 | } |
5078 | serge | 75 | |
6104 | serge | 76 | spin_lock(&rman->lock); |
5078 | serge | 77 | ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages, |
78 | mem->page_alignment, 0, |
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5271 | serge | 79 | place->fpfn, lpfn, |
80 | sflags, aflags); |
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6104 | serge | 81 | spin_unlock(&rman->lock); |
4075 | Serge | 82 | |
4112 | Serge | 83 | if (unlikely(ret)) { |
84 | kfree(node); |
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85 | } else { |
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6104 | serge | 86 | mem->mm_node = node; |
87 | mem->start = node->start; |
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4112 | Serge | 88 | } |
89 | |||
4075 | Serge | 90 | return 0; |
91 | } |
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92 | |||
93 | static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man, |
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94 | struct ttm_mem_reg *mem) |
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95 | { |
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96 | struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; |
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97 | |||
98 | if (mem->mm_node) { |
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99 | spin_lock(&rman->lock); |
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4112 | Serge | 100 | drm_mm_remove_node(mem->mm_node); |
4075 | Serge | 101 | spin_unlock(&rman->lock); |
4112 | Serge | 102 | |
103 | kfree(mem->mm_node); |
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4075 | Serge | 104 | mem->mm_node = NULL; |
105 | } |
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106 | } |
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107 | |||
108 | static int ttm_bo_man_init(struct ttm_mem_type_manager *man, |
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109 | unsigned long p_size) |
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110 | { |
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111 | struct ttm_range_manager *rman; |
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112 | |||
113 | rman = kzalloc(sizeof(*rman), GFP_KERNEL); |
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114 | if (!rman) |
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115 | return -ENOMEM; |
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116 | |||
117 | drm_mm_init(&rman->mm, 0, p_size); |
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118 | spin_lock_init(&rman->lock); |
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119 | man->priv = rman; |
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120 | return 0; |
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121 | } |
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122 | |||
123 | static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man) |
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124 | { |
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125 | struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; |
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126 | struct drm_mm *mm = &rman->mm; |
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127 | |||
128 | spin_lock(&rman->lock); |
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129 | if (drm_mm_clean(mm)) { |
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130 | drm_mm_takedown(mm); |
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131 | spin_unlock(&rman->lock); |
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132 | kfree(rman); |
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133 | man->priv = NULL; |
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134 | return 0; |
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135 | } |
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136 | spin_unlock(&rman->lock); |
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137 | return -EBUSY; |
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138 | } |
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139 | |||
140 | static void ttm_bo_man_debug(struct ttm_mem_type_manager *man, |
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141 | const char *prefix) |
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142 | { |
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143 | struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; |
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144 | |||
145 | spin_lock(&rman->lock); |
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146 | drm_mm_debug_table(&rman->mm, prefix); |
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147 | spin_unlock(&rman->lock); |
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148 | } |
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149 | |||
150 | const struct ttm_mem_type_manager_func ttm_bo_manager_func = { |
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151 | ttm_bo_man_init, |
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152 | ttm_bo_man_takedown, |
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153 | ttm_bo_man_get_node, |
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154 | ttm_bo_man_put_node, |
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155 | ttm_bo_man_debug |
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156 | }; |
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157 | EXPORT_SYMBOL(ttm_bo_manager_func); |