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4075 | 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 | #define pr_fmt(fmt) "[TTM] " fmt |
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29 | |||
30 | #include |
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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 | #include |
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39 | |||
40 | struct sysinfo { |
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41 | u32_t totalram; /* Total usable main memory size */ |
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42 | u32_t freeram; /* Available memory size */ |
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43 | u32_t sharedram; /* Amount of shared memory */ |
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44 | u32_t bufferram; /* Memory used by buffers */ |
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45 | u32_t totalswap; /* Total swap space size */ |
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46 | u32_t freeswap; /* swap space still available */ |
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47 | u32_t totalhigh; /* Total high memory size */ |
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48 | u32_t freehigh; /* Available high memory size */ |
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49 | u32_t mem_unit; /* Memory unit size in bytes */ |
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50 | }; |
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51 | |||
52 | |||
53 | #define TTM_MEMORY_ALLOC_RETRIES 4 |
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54 | |||
55 | struct ttm_mem_zone { |
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56 | struct kobject kobj; |
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57 | struct ttm_mem_global *glob; |
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58 | const char *name; |
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59 | uint64_t zone_mem; |
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60 | uint64_t emer_mem; |
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61 | uint64_t max_mem; |
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62 | uint64_t swap_limit; |
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63 | uint64_t used_mem; |
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64 | }; |
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65 | |||
66 | #if 0 |
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67 | |||
68 | static struct attribute ttm_mem_sys = { |
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69 | .name = "zone_memory", |
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70 | .mode = S_IRUGO |
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71 | }; |
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72 | static struct attribute ttm_mem_emer = { |
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73 | .name = "emergency_memory", |
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74 | .mode = S_IRUGO | S_IWUSR |
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75 | }; |
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76 | static struct attribute ttm_mem_max = { |
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77 | .name = "available_memory", |
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78 | .mode = S_IRUGO | S_IWUSR |
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79 | }; |
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80 | static struct attribute ttm_mem_swap = { |
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81 | .name = "swap_limit", |
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82 | .mode = S_IRUGO | S_IWUSR |
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83 | }; |
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84 | static struct attribute ttm_mem_used = { |
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85 | .name = "used_memory", |
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86 | .mode = S_IRUGO |
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87 | }; |
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88 | #endif |
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89 | |||
90 | static void ttm_mem_zone_kobj_release(struct kobject *kobj) |
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91 | { |
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92 | struct ttm_mem_zone *zone = |
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93 | container_of(kobj, struct ttm_mem_zone, kobj); |
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94 | |||
95 | pr_info("Zone %7s: Used memory at exit: %llu kiB\n", |
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96 | zone->name, (unsigned long long)zone->used_mem >> 10); |
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97 | kfree(zone); |
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98 | } |
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99 | |||
100 | #if 0 |
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101 | static ssize_t ttm_mem_zone_show(struct kobject *kobj, |
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102 | struct attribute *attr, |
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103 | char *buffer) |
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104 | { |
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105 | struct ttm_mem_zone *zone = |
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106 | container_of(kobj, struct ttm_mem_zone, kobj); |
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107 | uint64_t val = 0; |
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108 | |||
109 | spin_lock(&zone->glob->lock); |
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110 | if (attr == &ttm_mem_sys) |
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111 | val = zone->zone_mem; |
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112 | else if (attr == &ttm_mem_emer) |
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113 | val = zone->emer_mem; |
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114 | else if (attr == &ttm_mem_max) |
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115 | val = zone->max_mem; |
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116 | else if (attr == &ttm_mem_swap) |
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117 | val = zone->swap_limit; |
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118 | else if (attr == &ttm_mem_used) |
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119 | val = zone->used_mem; |
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120 | spin_unlock(&zone->glob->lock); |
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121 | |||
122 | return snprintf(buffer, PAGE_SIZE, "%llu\n", |
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123 | (unsigned long long) val >> 10); |
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124 | } |
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125 | |||
126 | static void ttm_check_swapping(struct ttm_mem_global *glob); |
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127 | |||
128 | static ssize_t ttm_mem_zone_store(struct kobject *kobj, |
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129 | struct attribute *attr, |
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130 | const char *buffer, |
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131 | size_t size) |
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132 | { |
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133 | struct ttm_mem_zone *zone = |
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134 | container_of(kobj, struct ttm_mem_zone, kobj); |
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135 | int chars; |
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136 | unsigned long val; |
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137 | uint64_t val64; |
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138 | |||
139 | chars = sscanf(buffer, "%lu", &val); |
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140 | if (chars == 0) |
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141 | return size; |
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142 | |||
143 | val64 = val; |
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144 | val64 <<= 10; |
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145 | |||
146 | spin_lock(&zone->glob->lock); |
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147 | if (val64 > zone->zone_mem) |
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148 | val64 = zone->zone_mem; |
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149 | if (attr == &ttm_mem_emer) { |
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150 | zone->emer_mem = val64; |
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151 | if (zone->max_mem > val64) |
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152 | zone->max_mem = val64; |
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153 | } else if (attr == &ttm_mem_max) { |
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154 | zone->max_mem = val64; |
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155 | if (zone->emer_mem < val64) |
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156 | zone->emer_mem = val64; |
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157 | } else if (attr == &ttm_mem_swap) |
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158 | zone->swap_limit = val64; |
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159 | spin_unlock(&zone->glob->lock); |
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160 | |||
161 | ttm_check_swapping(zone->glob); |
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162 | |||
163 | return size; |
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164 | } |
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165 | #endif |
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166 | |||
167 | //static struct attribute *ttm_mem_zone_attrs[] = { |
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168 | // &ttm_mem_sys, |
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169 | // &ttm_mem_emer, |
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170 | // &ttm_mem_max, |
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171 | // &ttm_mem_swap, |
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172 | // &ttm_mem_used, |
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173 | // NULL |
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174 | //}; |
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175 | |||
176 | //static const struct sysfs_ops ttm_mem_zone_ops = { |
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177 | // .show = &ttm_mem_zone_show, |
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178 | // .store = &ttm_mem_zone_store |
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179 | //}; |
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180 | |||
181 | static struct kobj_type ttm_mem_zone_kobj_type = { |
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182 | .release = &ttm_mem_zone_kobj_release, |
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183 | // .sysfs_ops = &ttm_mem_zone_ops, |
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184 | // .default_attrs = ttm_mem_zone_attrs, |
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185 | }; |
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186 | |||
187 | static void ttm_mem_global_kobj_release(struct kobject *kobj) |
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188 | { |
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189 | struct ttm_mem_global *glob = |
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190 | container_of(kobj, struct ttm_mem_global, kobj); |
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191 | |||
192 | kfree(glob); |
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193 | } |
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194 | |||
195 | static struct kobj_type ttm_mem_glob_kobj_type = { |
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196 | .release = &ttm_mem_global_kobj_release, |
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197 | }; |
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198 | |||
199 | #if 0 |
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200 | static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob, |
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201 | bool from_wq, uint64_t extra) |
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202 | { |
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203 | unsigned int i; |
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204 | struct ttm_mem_zone *zone; |
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205 | uint64_t target; |
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206 | |||
207 | for (i = 0; i < glob->num_zones; ++i) { |
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208 | zone = glob->zones[i]; |
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209 | |||
210 | if (from_wq) |
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211 | target = zone->swap_limit; |
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212 | else if (capable(CAP_SYS_ADMIN)) |
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213 | target = zone->emer_mem; |
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214 | else |
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215 | target = zone->max_mem; |
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216 | |||
217 | target = (extra > target) ? 0ULL : target; |
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218 | |||
219 | if (zone->used_mem > target) |
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220 | return true; |
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221 | } |
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222 | return false; |
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223 | } |
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224 | |||
225 | /** |
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226 | * At this point we only support a single shrink callback. |
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227 | * Extend this if needed, perhaps using a linked list of callbacks. |
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228 | * Note that this function is reentrant: |
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229 | * many threads may try to swap out at any given time. |
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230 | */ |
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231 | |||
232 | static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq, |
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233 | uint64_t extra) |
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234 | { |
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235 | int ret; |
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236 | struct ttm_mem_shrink *shrink; |
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237 | |||
238 | spin_lock(&glob->lock); |
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239 | if (glob->shrink == NULL) |
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240 | goto out; |
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241 | |||
242 | while (ttm_zones_above_swap_target(glob, from_wq, extra)) { |
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243 | shrink = glob->shrink; |
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244 | spin_unlock(&glob->lock); |
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245 | ret = shrink->do_shrink(shrink); |
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246 | spin_lock(&glob->lock); |
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247 | if (unlikely(ret != 0)) |
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248 | goto out; |
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249 | } |
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250 | out: |
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251 | spin_unlock(&glob->lock); |
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252 | } |
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253 | |||
254 | |||
255 | |||
256 | static void ttm_shrink_work(struct work_struct *work) |
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257 | { |
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258 | struct ttm_mem_global *glob = |
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259 | container_of(work, struct ttm_mem_global, work); |
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260 | |||
261 | ttm_shrink(glob, true, 0ULL); |
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262 | } |
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263 | #endif |
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264 | |||
265 | static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob, |
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266 | const struct sysinfo *si) |
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267 | { |
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268 | struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL); |
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269 | uint64_t mem; |
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270 | int ret; |
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271 | |||
272 | if (unlikely(!zone)) |
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273 | return -ENOMEM; |
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274 | |||
275 | // mem = si->totalram - si->totalhigh; |
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276 | // mem *= si->mem_unit; |
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277 | |||
278 | zone->name = "kernel"; |
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279 | zone->zone_mem = mem; |
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280 | zone->max_mem = mem >> 1; |
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281 | zone->emer_mem = (mem >> 1) + (mem >> 2); |
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282 | zone->swap_limit = zone->max_mem - (mem >> 3); |
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283 | zone->used_mem = 0; |
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284 | zone->glob = glob; |
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285 | glob->zone_kernel = zone; |
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286 | ret = kobject_init_and_add( |
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287 | &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name); |
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288 | if (unlikely(ret != 0)) { |
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289 | kobject_put(&zone->kobj); |
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290 | return ret; |
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291 | } |
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292 | glob->zones[glob->num_zones++] = zone; |
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293 | return 0; |
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294 | } |
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295 | |||
296 | #if 0 |
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297 | #ifdef CONFIG_HIGHMEM |
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298 | static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob, |
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299 | const struct sysinfo *si) |
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300 | { |
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301 | struct ttm_mem_zone *zone; |
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302 | uint64_t mem; |
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303 | int ret; |
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304 | |||
305 | if (si->totalhigh == 0) |
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306 | return 0; |
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307 | |||
308 | zone = kzalloc(sizeof(*zone), GFP_KERNEL); |
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309 | if (unlikely(!zone)) |
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310 | return -ENOMEM; |
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311 | |||
312 | mem = si->totalram; |
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313 | mem *= si->mem_unit; |
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314 | |||
315 | zone->name = "highmem"; |
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316 | zone->zone_mem = mem; |
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317 | zone->max_mem = mem >> 1; |
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318 | zone->emer_mem = (mem >> 1) + (mem >> 2); |
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319 | zone->swap_limit = zone->max_mem - (mem >> 3); |
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320 | zone->used_mem = 0; |
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321 | zone->glob = glob; |
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322 | glob->zone_highmem = zone; |
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323 | ret = kobject_init_and_add( |
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324 | &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name); |
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325 | if (unlikely(ret != 0)) { |
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326 | kobject_put(&zone->kobj); |
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327 | return ret; |
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328 | } |
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329 | glob->zones[glob->num_zones++] = zone; |
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330 | return 0; |
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331 | } |
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332 | #else |
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333 | static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob, |
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334 | const struct sysinfo *si) |
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335 | { |
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336 | struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL); |
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337 | uint64_t mem; |
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338 | int ret; |
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339 | |||
340 | if (unlikely(!zone)) |
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341 | return -ENOMEM; |
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342 | |||
343 | mem = si->totalram; |
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344 | mem *= si->mem_unit; |
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345 | |||
346 | /** |
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347 | * No special dma32 zone needed. |
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348 | */ |
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349 | |||
350 | if (mem <= ((uint64_t) 1ULL << 32)) { |
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351 | kfree(zone); |
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352 | return 0; |
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353 | } |
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354 | |||
355 | /* |
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356 | * Limit max dma32 memory to 4GB for now |
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357 | * until we can figure out how big this |
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358 | * zone really is. |
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359 | */ |
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360 | |||
361 | mem = ((uint64_t) 1ULL << 32); |
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362 | zone->name = "dma32"; |
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363 | zone->zone_mem = mem; |
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364 | zone->max_mem = mem >> 1; |
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365 | zone->emer_mem = (mem >> 1) + (mem >> 2); |
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366 | zone->swap_limit = zone->max_mem - (mem >> 3); |
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367 | zone->used_mem = 0; |
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368 | zone->glob = glob; |
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369 | glob->zone_dma32 = zone; |
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370 | ret = kobject_init_and_add( |
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371 | &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name); |
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372 | if (unlikely(ret != 0)) { |
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373 | kobject_put(&zone->kobj); |
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374 | return ret; |
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375 | } |
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376 | glob->zones[glob->num_zones++] = zone; |
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377 | return 0; |
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378 | } |
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379 | #endif |
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380 | |||
381 | |||
382 | |||
383 | void ttm_mem_global_release(struct ttm_mem_global *glob) |
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384 | { |
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385 | unsigned int i; |
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386 | struct ttm_mem_zone *zone; |
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387 | |||
388 | /* let the page allocator first stop the shrink work. */ |
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389 | ttm_page_alloc_fini(); |
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390 | ttm_dma_page_alloc_fini(); |
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391 | |||
392 | flush_workqueue(glob->swap_queue); |
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393 | destroy_workqueue(glob->swap_queue); |
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394 | glob->swap_queue = NULL; |
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395 | for (i = 0; i < glob->num_zones; ++i) { |
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396 | zone = glob->zones[i]; |
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397 | kobject_del(&zone->kobj); |
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398 | kobject_put(&zone->kobj); |
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399 | } |
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400 | kobject_del(&glob->kobj); |
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401 | kobject_put(&glob->kobj); |
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402 | } |
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403 | EXPORT_SYMBOL(ttm_mem_global_release); |
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404 | |||
405 | static void ttm_check_swapping(struct ttm_mem_global *glob) |
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406 | { |
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407 | bool needs_swapping = false; |
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408 | unsigned int i; |
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409 | struct ttm_mem_zone *zone; |
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410 | |||
411 | spin_lock(&glob->lock); |
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412 | for (i = 0; i < glob->num_zones; ++i) { |
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413 | zone = glob->zones[i]; |
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414 | if (zone->used_mem > zone->swap_limit) { |
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415 | needs_swapping = true; |
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416 | break; |
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417 | } |
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418 | } |
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419 | |||
420 | spin_unlock(&glob->lock); |
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421 | |||
422 | if (unlikely(needs_swapping)) |
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423 | (void)queue_work(glob->swap_queue, &glob->work); |
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424 | |||
425 | } |
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426 | |||
427 | static void ttm_mem_global_free_zone(struct ttm_mem_global *glob, |
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428 | struct ttm_mem_zone *single_zone, |
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429 | uint64_t amount) |
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430 | { |
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431 | unsigned int i; |
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432 | struct ttm_mem_zone *zone; |
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433 | |||
434 | spin_lock(&glob->lock); |
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435 | for (i = 0; i < glob->num_zones; ++i) { |
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436 | zone = glob->zones[i]; |
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437 | if (single_zone && zone != single_zone) |
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438 | continue; |
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439 | zone->used_mem -= amount; |
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440 | } |
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441 | spin_unlock(&glob->lock); |
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442 | } |
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443 | |||
444 | void ttm_mem_global_free(struct ttm_mem_global *glob, |
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445 | uint64_t amount) |
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446 | { |
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447 | return ttm_mem_global_free_zone(glob, NULL, amount); |
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448 | } |
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449 | EXPORT_SYMBOL(ttm_mem_global_free); |
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450 | |||
451 | static int ttm_mem_global_reserve(struct ttm_mem_global *glob, |
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452 | struct ttm_mem_zone *single_zone, |
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453 | uint64_t amount, bool reserve) |
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454 | { |
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455 | uint64_t limit; |
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456 | int ret = -ENOMEM; |
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457 | unsigned int i; |
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458 | struct ttm_mem_zone *zone; |
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459 | |||
460 | spin_lock(&glob->lock); |
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461 | for (i = 0; i < glob->num_zones; ++i) { |
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462 | zone = glob->zones[i]; |
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463 | if (single_zone && zone != single_zone) |
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464 | continue; |
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465 | |||
466 | limit = zone->emer_mem; |
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467 | |||
468 | if (zone->used_mem > limit) |
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469 | goto out_unlock; |
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470 | } |
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471 | |||
472 | if (reserve) { |
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473 | for (i = 0; i < glob->num_zones; ++i) { |
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474 | zone = glob->zones[i]; |
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475 | if (single_zone && zone != single_zone) |
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476 | continue; |
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477 | zone->used_mem += amount; |
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478 | } |
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479 | } |
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480 | |||
481 | ret = 0; |
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482 | out_unlock: |
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483 | spin_unlock(&glob->lock); |
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484 | ttm_check_swapping(glob); |
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485 | |||
486 | return ret; |
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487 | } |
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488 | |||
489 | |||
490 | static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob, |
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491 | struct ttm_mem_zone *single_zone, |
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492 | uint64_t memory, |
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493 | bool no_wait, bool interruptible) |
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494 | { |
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495 | int count = TTM_MEMORY_ALLOC_RETRIES; |
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496 | |||
497 | while (unlikely(ttm_mem_global_reserve(glob, |
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498 | single_zone, |
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499 | memory, true) |
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500 | != 0)) { |
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501 | if (no_wait) |
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502 | return -ENOMEM; |
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503 | if (unlikely(count-- == 0)) |
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504 | return -ENOMEM; |
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505 | ttm_shrink(glob, false, memory + (memory >> 2) + 16); |
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506 | } |
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507 | |||
508 | return 0; |
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509 | } |
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510 | |||
511 | int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory, |
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512 | bool no_wait, bool interruptible) |
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513 | { |
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514 | /** |
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515 | * Normal allocations of kernel memory are registered in |
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516 | * all zones. |
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517 | */ |
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518 | |||
519 | return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait, |
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520 | interruptible); |
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521 | } |
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522 | EXPORT_SYMBOL(ttm_mem_global_alloc); |
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523 | |||
524 | int ttm_mem_global_alloc_page(struct ttm_mem_global *glob, |
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525 | struct page *page, |
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526 | bool no_wait, bool interruptible) |
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527 | { |
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528 | |||
529 | struct ttm_mem_zone *zone = NULL; |
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530 | |||
531 | /** |
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532 | * Page allocations may be registed in a single zone |
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533 | * only if highmem or !dma32. |
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534 | */ |
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535 | |||
536 | #ifdef CONFIG_HIGHMEM |
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537 | if (PageHighMem(page) && glob->zone_highmem != NULL) |
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538 | zone = glob->zone_highmem; |
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539 | #else |
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540 | if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL) |
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541 | zone = glob->zone_kernel; |
||
542 | #endif |
||
543 | return ttm_mem_global_alloc_zone(glob, zone, PAGE_SIZE, no_wait, |
||
544 | interruptible); |
||
545 | } |
||
546 | |||
547 | void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page) |
||
548 | { |
||
549 | struct ttm_mem_zone *zone = NULL; |
||
550 | |||
551 | #ifdef CONFIG_HIGHMEM |
||
552 | if (PageHighMem(page) && glob->zone_highmem != NULL) |
||
553 | zone = glob->zone_highmem; |
||
554 | #else |
||
555 | if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL) |
||
556 | zone = glob->zone_kernel; |
||
557 | #endif |
||
558 | ttm_mem_global_free_zone(glob, zone, PAGE_SIZE); |
||
559 | } |
||
560 | |||
561 | #endif |
||
562 | |||
563 | void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page) |
||
564 | { |
||
565 | |||
566 | } |
||
567 | |||
568 | size_t ttm_round_pot(size_t size) |
||
569 | { |
||
570 | if ((size & (size - 1)) == 0) |
||
571 | return size; |
||
572 | else if (size > PAGE_SIZE) |
||
573 | return PAGE_ALIGN(size); |
||
574 | else { |
||
575 | size_t tmp_size = 4; |
||
576 | |||
577 | while (tmp_size < size) |
||
578 | tmp_size <<= 1; |
||
579 | |||
580 | return tmp_size; |
||
581 | } |
||
582 | return 0; |
||
583 | } |
||
584 | EXPORT_SYMBOL(ttm_round_pot); |
||
585 | |||
586 | void ttm_mem_global_free(struct ttm_mem_global *glob, |
||
587 | uint64_t amount) |
||
588 | { |
||
589 | return 0; |
||
590 | } |
||
591 | |||
592 | |||
593 | int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory, |
||
594 | bool no_wait, bool interruptible) |
||
595 | { |
||
596 | return 0; |
||
597 | } |
||
598 | |||
599 | EXPORT_SYMBOL(ttm_mem_global_alloc); |
||
600 | |||
601 | int ttm_mem_global_init(struct ttm_mem_global *glob) |
||
602 | { |
||
603 | return 0; |
||
604 | } |
||
605 | EXPORT_SYMBOL(ttm_mem_global_init);=><=>>>>>>>><>><>=>>>=><=> |