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3262 | Serge | 1 | /************************************************************************** |
2 | * |
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3 | * Copyright (c) 2006-2009 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 | |||
28 | #ifndef TTM_MEMORY_H |
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29 | #define TTM_MEMORY_H |
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30 | |||
3763 | Serge | 31 | #include |
3262 | Serge | 32 | #include |
33 | #include |
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34 | #include |
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35 | #include |
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3763 | Serge | 36 | #include |
3262 | Serge | 37 | #include |
38 | |||
39 | /** |
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40 | * struct ttm_mem_shrink - callback to shrink TTM memory usage. |
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41 | * |
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42 | * @do_shrink: The callback function. |
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43 | * |
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44 | * Arguments to the do_shrink functions are intended to be passed using |
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45 | * inheritance. That is, the argument class derives from struct ttm_mem_shrink, |
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46 | * and can be accessed using container_of(). |
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47 | */ |
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48 | |||
49 | struct ttm_mem_shrink { |
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50 | int (*do_shrink) (struct ttm_mem_shrink *); |
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51 | }; |
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52 | |||
53 | /** |
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54 | * struct ttm_mem_global - Global memory accounting structure. |
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55 | * |
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56 | * @shrink: A single callback to shrink TTM memory usage. Extend this |
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57 | * to a linked list to be able to handle multiple callbacks when needed. |
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58 | * @swap_queue: A workqueue to handle shrinking in low memory situations. We |
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59 | * need a separate workqueue since it will spend a lot of time waiting |
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60 | * for the GPU, and this will otherwise block other workqueue tasks(?) |
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61 | * At this point we use only a single-threaded workqueue. |
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62 | * @work: The workqueue callback for the shrink queue. |
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63 | * @lock: Lock to protect the @shrink - and the memory accounting members, |
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64 | * that is, essentially the whole structure with some exceptions. |
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65 | * @zones: Array of pointers to accounting zones. |
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66 | * @num_zones: Number of populated entries in the @zones array. |
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67 | * @zone_kernel: Pointer to the kernel zone. |
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68 | * @zone_highmem: Pointer to the highmem zone if there is one. |
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69 | * @zone_dma32: Pointer to the dma32 zone if there is one. |
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70 | * |
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71 | * Note that this structure is not per device. It should be global for all |
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72 | * graphics devices. |
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73 | */ |
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74 | |||
75 | #define TTM_MEM_MAX_ZONES 2 |
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76 | struct ttm_mem_zone; |
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77 | struct ttm_mem_global { |
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3763 | Serge | 78 | struct kobject kobj; |
3262 | Serge | 79 | struct ttm_mem_shrink *shrink; |
80 | struct workqueue_struct *swap_queue; |
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81 | struct work_struct work; |
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82 | spinlock_t lock; |
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83 | struct ttm_mem_zone *zones[TTM_MEM_MAX_ZONES]; |
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84 | unsigned int num_zones; |
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85 | struct ttm_mem_zone *zone_kernel; |
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86 | #ifdef CONFIG_HIGHMEM |
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87 | struct ttm_mem_zone *zone_highmem; |
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88 | #else |
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89 | struct ttm_mem_zone *zone_dma32; |
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90 | #endif |
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91 | }; |
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92 | |||
93 | /** |
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94 | * ttm_mem_init_shrink - initialize a struct ttm_mem_shrink object |
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95 | * |
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96 | * @shrink: The object to initialize. |
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97 | * @func: The callback function. |
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98 | */ |
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99 | |||
100 | static inline void ttm_mem_init_shrink(struct ttm_mem_shrink *shrink, |
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101 | int (*func) (struct ttm_mem_shrink *)) |
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102 | { |
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103 | shrink->do_shrink = func; |
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104 | } |
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105 | |||
106 | /** |
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107 | * ttm_mem_register_shrink - register a struct ttm_mem_shrink object. |
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108 | * |
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109 | * @glob: The struct ttm_mem_global object to register with. |
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110 | * @shrink: An initialized struct ttm_mem_shrink object to register. |
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111 | * |
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112 | * Returns: |
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113 | * -EBUSY: There's already a callback registered. (May change). |
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114 | */ |
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115 | |||
116 | static inline int ttm_mem_register_shrink(struct ttm_mem_global *glob, |
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117 | struct ttm_mem_shrink *shrink) |
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118 | { |
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119 | spin_lock(&glob->lock); |
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120 | if (glob->shrink != NULL) { |
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121 | spin_unlock(&glob->lock); |
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122 | return -EBUSY; |
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123 | } |
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124 | glob->shrink = shrink; |
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125 | spin_unlock(&glob->lock); |
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126 | return 0; |
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127 | } |
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128 | |||
129 | /** |
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130 | * ttm_mem_unregister_shrink - unregister a struct ttm_mem_shrink object. |
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131 | * |
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132 | * @glob: The struct ttm_mem_global object to unregister from. |
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133 | * @shrink: A previously registert struct ttm_mem_shrink object. |
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134 | * |
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135 | */ |
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136 | |||
137 | static inline void ttm_mem_unregister_shrink(struct ttm_mem_global *glob, |
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138 | struct ttm_mem_shrink *shrink) |
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139 | { |
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140 | spin_lock(&glob->lock); |
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141 | BUG_ON(glob->shrink != shrink); |
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142 | glob->shrink = NULL; |
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143 | spin_unlock(&glob->lock); |
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144 | } |
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145 | |||
146 | extern int ttm_mem_global_init(struct ttm_mem_global *glob); |
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147 | extern void ttm_mem_global_release(struct ttm_mem_global *glob); |
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148 | extern int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory, |
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149 | bool no_wait, bool interruptible); |
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150 | extern void ttm_mem_global_free(struct ttm_mem_global *glob, |
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151 | uint64_t amount); |
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152 | extern int ttm_mem_global_alloc_page(struct ttm_mem_global *glob, |
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153 | struct page *page, |
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154 | bool no_wait, bool interruptible); |
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155 | extern void ttm_mem_global_free_page(struct ttm_mem_global *glob, |
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156 | struct page *page); |
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157 | extern size_t ttm_round_pot(size_t size); |
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158 | #endif |