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Rev | Author | Line No. | Line |
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3260 | Serge | 1 | /* |
2 | * Copyright © 2008 Intel Corporation |
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3 | * |
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4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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5 | * copy of this software and associated documentation files (the "Software"), |
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6 | * to deal in the Software without restriction, including without limitation |
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7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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8 | * and/or sell copies of the Software, and to permit persons to whom the |
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9 | * Software is furnished to do so, subject to the following conditions: |
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10 | * |
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11 | * The above copyright notice and this permission notice (including the next |
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12 | * paragraph) shall be included in all copies or substantial portions of the |
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13 | * Software. |
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14 | * |
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15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
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21 | * IN THE SOFTWARE. |
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22 | * |
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23 | * Authors: |
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24 | * Eric Anholt |
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25 | * |
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26 | */ |
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27 | |||
28 | #include |
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29 | #include |
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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 | |||
36 | /** @file drm_gem.c |
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37 | * |
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38 | * This file provides some of the base ioctls and library routines for |
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39 | * the graphics memory manager implemented by each device driver. |
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40 | * |
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41 | * Because various devices have different requirements in terms of |
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42 | * synchronization and migration strategies, implementing that is left up to |
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43 | * the driver, and all that the general API provides should be generic -- |
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44 | * allocating objects, reading/writing data with the cpu, freeing objects. |
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45 | * Even there, platform-dependent optimizations for reading/writing data with |
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46 | * the CPU mean we'll likely hook those out to driver-specific calls. However, |
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47 | * the DRI2 implementation wants to have at least allocate/mmap be generic. |
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48 | * |
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49 | * The goal was to have swap-backed object allocation managed through |
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50 | * struct file. However, file descriptors as handles to a struct file have |
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51 | * two major failings: |
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52 | * - Process limits prevent more than 1024 or so being used at a time by |
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53 | * default. |
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54 | * - Inability to allocate high fds will aggravate the X Server's select() |
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55 | * handling, and likely that of many GL client applications as well. |
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56 | * |
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57 | * This led to a plan of using our own integer IDs (called handles, following |
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58 | * DRM terminology) to mimic fds, and implement the fd syscalls we need as |
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59 | * ioctls. The objects themselves will still include the struct file so |
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60 | * that we can transition to fds if the required kernel infrastructure shows |
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61 | * up at a later date, and as our interface with shmfs for memory allocation. |
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62 | */ |
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63 | |||
64 | /* |
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65 | * We make up offsets for buffer objects so we can recognize them at |
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66 | * mmap time. |
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67 | */ |
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68 | |||
69 | /* pgoff in mmap is an unsigned long, so we need to make sure that |
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70 | * the faked up offset will fit |
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71 | */ |
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72 | |||
73 | #if BITS_PER_LONG == 64 |
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74 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1) |
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75 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16) |
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76 | #else |
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77 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1) |
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78 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16) |
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79 | #endif |
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80 | |||
81 | #if 0 |
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82 | /** |
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83 | * Initialize the GEM device fields |
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84 | */ |
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85 | |||
86 | int |
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87 | drm_gem_init(struct drm_device *dev) |
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88 | { |
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89 | struct drm_gem_mm *mm; |
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90 | |||
91 | spin_lock_init(&dev->object_name_lock); |
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92 | idr_init(&dev->object_name_idr); |
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93 | |||
94 | mm = kzalloc(sizeof(struct drm_gem_mm), GFP_KERNEL); |
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95 | if (!mm) { |
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96 | DRM_ERROR("out of memory\n"); |
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97 | return -ENOMEM; |
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98 | } |
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99 | |||
100 | dev->mm_private = mm; |
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101 | |||
102 | if (drm_ht_create(&mm->offset_hash, 12)) { |
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103 | kfree(mm); |
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104 | return -ENOMEM; |
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105 | } |
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106 | |||
4075 | Serge | 107 | drm_mm_init(&mm->offset_manager, DRM_FILE_PAGE_OFFSET_START, |
108 | DRM_FILE_PAGE_OFFSET_SIZE); |
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3260 | Serge | 109 | |
110 | return 0; |
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111 | } |
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112 | |||
113 | void |
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114 | drm_gem_destroy(struct drm_device *dev) |
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115 | { |
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116 | struct drm_gem_mm *mm = dev->mm_private; |
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117 | |||
118 | drm_mm_takedown(&mm->offset_manager); |
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119 | drm_ht_remove(&mm->offset_hash); |
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120 | kfree(mm); |
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121 | dev->mm_private = NULL; |
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122 | } |
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123 | #endif |
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124 | |||
125 | /** |
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126 | * Initialize an already allocated GEM object of the specified size with |
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127 | * shmfs backing store. |
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128 | */ |
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129 | int drm_gem_object_init(struct drm_device *dev, |
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130 | struct drm_gem_object *obj, size_t size) |
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131 | { |
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132 | BUG_ON((size & (PAGE_SIZE - 1)) != 0); |
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133 | |||
134 | obj->dev = dev; |
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135 | obj->filp = shmem_file_setup("drm mm object", size, VM_NORESERVE); |
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136 | if (IS_ERR(obj->filp)) |
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137 | return PTR_ERR(obj->filp); |
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138 | |||
139 | kref_init(&obj->refcount); |
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140 | atomic_set(&obj->handle_count, 0); |
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141 | obj->size = size; |
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142 | |||
143 | return 0; |
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144 | } |
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145 | EXPORT_SYMBOL(drm_gem_object_init); |
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146 | |||
147 | /** |
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148 | * Initialize an already allocated GEM object of the specified size with |
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149 | * no GEM provided backing store. Instead the caller is responsible for |
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150 | * backing the object and handling it. |
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151 | */ |
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152 | int drm_gem_private_object_init(struct drm_device *dev, |
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153 | struct drm_gem_object *obj, size_t size) |
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154 | { |
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155 | BUG_ON((size & (PAGE_SIZE - 1)) != 0); |
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156 | |||
157 | obj->dev = dev; |
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158 | obj->filp = NULL; |
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159 | |||
160 | kref_init(&obj->refcount); |
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161 | atomic_set(&obj->handle_count, 0); |
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162 | obj->size = size; |
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163 | |||
164 | return 0; |
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165 | } |
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166 | EXPORT_SYMBOL(drm_gem_private_object_init); |
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167 | |||
168 | /** |
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169 | * Allocate a GEM object of the specified size with shmfs backing store |
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170 | */ |
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171 | struct drm_gem_object * |
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172 | drm_gem_object_alloc(struct drm_device *dev, size_t size) |
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173 | { |
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174 | struct drm_gem_object *obj; |
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175 | |||
176 | obj = kzalloc(sizeof(*obj), GFP_KERNEL); |
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177 | if (!obj) |
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178 | goto free; |
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179 | |||
180 | if (drm_gem_object_init(dev, obj, size) != 0) |
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181 | goto free; |
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182 | |||
183 | if (dev->driver->gem_init_object != NULL && |
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184 | dev->driver->gem_init_object(obj) != 0) { |
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185 | goto fput; |
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186 | } |
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187 | return obj; |
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188 | fput: |
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189 | /* Object_init mangles the global counters - readjust them. */ |
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190 | free(obj->filp); |
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191 | free: |
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192 | kfree(obj); |
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193 | return NULL; |
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194 | } |
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195 | EXPORT_SYMBOL(drm_gem_object_alloc); |
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196 | |||
197 | |||
198 | /** |
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199 | * Removes the mapping from handle to filp for this object. |
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200 | */ |
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201 | int |
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202 | drm_gem_handle_delete(struct drm_file *filp, u32 handle) |
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203 | { |
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204 | struct drm_device *dev; |
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205 | struct drm_gem_object *obj; |
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206 | |||
207 | /* This is gross. The idr system doesn't let us try a delete and |
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208 | * return an error code. It just spews if you fail at deleting. |
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209 | * So, we have to grab a lock around finding the object and then |
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210 | * doing the delete on it and dropping the refcount, or the user |
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211 | * could race us to double-decrement the refcount and cause a |
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212 | * use-after-free later. Given the frequency of our handle lookups, |
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213 | * we may want to use ida for number allocation and a hash table |
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214 | * for the pointers, anyway. |
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215 | */ |
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3480 | Serge | 216 | if(handle == -2) |
217 | printf("%s handle %d\n", __FUNCTION__, handle); |
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218 | |||
3260 | Serge | 219 | spin_lock(&filp->table_lock); |
220 | |||
221 | /* Check if we currently have a reference on the object */ |
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222 | obj = idr_find(&filp->object_idr, handle); |
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223 | if (obj == NULL) { |
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224 | spin_unlock(&filp->table_lock); |
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225 | return -EINVAL; |
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226 | } |
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227 | dev = obj->dev; |
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228 | |||
3298 | Serge | 229 | // printf("%s handle %d obj %p\n", __FUNCTION__, handle, obj); |
3290 | Serge | 230 | |
3260 | Serge | 231 | /* Release reference and decrement refcount. */ |
232 | idr_remove(&filp->object_idr, handle); |
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233 | spin_unlock(&filp->table_lock); |
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234 | |||
235 | // drm_gem_remove_prime_handles(obj, filp); |
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236 | |||
237 | if (dev->driver->gem_close_object) |
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238 | dev->driver->gem_close_object(obj, filp); |
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239 | drm_gem_object_handle_unreference_unlocked(obj); |
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240 | |||
241 | return 0; |
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242 | } |
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243 | EXPORT_SYMBOL(drm_gem_handle_delete); |
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244 | |||
245 | /** |
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246 | * Create a handle for this object. This adds a handle reference |
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247 | * to the object, which includes a regular reference count. Callers |
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248 | * will likely want to dereference the object afterwards. |
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249 | */ |
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250 | int |
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251 | drm_gem_handle_create(struct drm_file *file_priv, |
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252 | struct drm_gem_object *obj, |
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253 | u32 *handlep) |
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254 | { |
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255 | struct drm_device *dev = obj->dev; |
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256 | int ret; |
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257 | |||
258 | /* |
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3480 | Serge | 259 | * Get the user-visible handle using idr. Preload and perform |
260 | * allocation under our spinlock. |
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3260 | Serge | 261 | */ |
3480 | Serge | 262 | idr_preload(GFP_KERNEL); |
263 | spin_lock(&file_priv->table_lock); |
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3260 | Serge | 264 | |
3480 | Serge | 265 | ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT); |
266 | |||
3260 | Serge | 267 | spin_unlock(&file_priv->table_lock); |
3480 | Serge | 268 | idr_preload_end(); |
269 | if (ret < 0) |
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3260 | Serge | 270 | return ret; |
3480 | Serge | 271 | *handlep = ret; |
3260 | Serge | 272 | |
273 | drm_gem_object_handle_reference(obj); |
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274 | |||
275 | if (dev->driver->gem_open_object) { |
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276 | ret = dev->driver->gem_open_object(obj, file_priv); |
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277 | if (ret) { |
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278 | drm_gem_handle_delete(file_priv, *handlep); |
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279 | return ret; |
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280 | } |
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281 | } |
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282 | |||
283 | return 0; |
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284 | } |
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285 | EXPORT_SYMBOL(drm_gem_handle_create); |
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286 | |||
287 | |||
288 | /** |
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289 | * drm_gem_free_mmap_offset - release a fake mmap offset for an object |
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290 | * @obj: obj in question |
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291 | * |
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292 | * This routine frees fake offsets allocated by drm_gem_create_mmap_offset(). |
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293 | */ |
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294 | #if 0 |
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295 | void |
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296 | drm_gem_free_mmap_offset(struct drm_gem_object *obj) |
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297 | { |
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298 | struct drm_device *dev = obj->dev; |
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299 | struct drm_gem_mm *mm = dev->mm_private; |
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300 | struct drm_map_list *list = &obj->map_list; |
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301 | |||
302 | drm_ht_remove_item(&mm->offset_hash, &list->hash); |
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303 | drm_mm_put_block(list->file_offset_node); |
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304 | kfree(list->map); |
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305 | list->map = NULL; |
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306 | } |
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307 | EXPORT_SYMBOL(drm_gem_free_mmap_offset); |
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308 | |||
309 | /** |
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310 | * drm_gem_create_mmap_offset - create a fake mmap offset for an object |
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311 | * @obj: obj in question |
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312 | * |
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313 | * GEM memory mapping works by handing back to userspace a fake mmap offset |
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314 | * it can use in a subsequent mmap(2) call. The DRM core code then looks |
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315 | * up the object based on the offset and sets up the various memory mapping |
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316 | * structures. |
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317 | * |
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318 | * This routine allocates and attaches a fake offset for @obj. |
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319 | */ |
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320 | int |
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321 | drm_gem_create_mmap_offset(struct drm_gem_object *obj) |
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322 | { |
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323 | struct drm_device *dev = obj->dev; |
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324 | struct drm_gem_mm *mm = dev->mm_private; |
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325 | struct drm_map_list *list; |
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326 | struct drm_local_map *map; |
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327 | int ret; |
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328 | |||
329 | /* Set the object up for mmap'ing */ |
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330 | list = &obj->map_list; |
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331 | list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL); |
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332 | if (!list->map) |
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333 | return -ENOMEM; |
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334 | |||
335 | map = list->map; |
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336 | map->type = _DRM_GEM; |
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337 | map->size = obj->size; |
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338 | map->handle = obj; |
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339 | |||
340 | /* Get a DRM GEM mmap offset allocated... */ |
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341 | list->file_offset_node = drm_mm_search_free(&mm->offset_manager, |
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342 | obj->size / PAGE_SIZE, 0, false); |
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343 | |||
344 | if (!list->file_offset_node) { |
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345 | DRM_ERROR("failed to allocate offset for bo %d\n", obj->name); |
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346 | ret = -ENOSPC; |
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347 | goto out_free_list; |
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348 | } |
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349 | |||
350 | list->file_offset_node = drm_mm_get_block(list->file_offset_node, |
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351 | obj->size / PAGE_SIZE, 0); |
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352 | if (!list->file_offset_node) { |
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353 | ret = -ENOMEM; |
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354 | goto out_free_list; |
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355 | } |
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356 | |||
357 | list->hash.key = list->file_offset_node->start; |
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358 | ret = drm_ht_insert_item(&mm->offset_hash, &list->hash); |
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359 | if (ret) { |
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360 | DRM_ERROR("failed to add to map hash\n"); |
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361 | goto out_free_mm; |
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362 | } |
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363 | |||
364 | return 0; |
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365 | |||
366 | out_free_mm: |
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367 | drm_mm_put_block(list->file_offset_node); |
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368 | out_free_list: |
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369 | kfree(list->map); |
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370 | list->map = NULL; |
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371 | |||
372 | return ret; |
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373 | } |
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374 | EXPORT_SYMBOL(drm_gem_create_mmap_offset); |
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375 | #endif |
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376 | |||
377 | /** Returns a reference to the object named by the handle. */ |
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378 | struct drm_gem_object * |
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379 | drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp, |
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380 | u32 handle) |
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381 | { |
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382 | struct drm_gem_object *obj; |
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383 | |||
3480 | Serge | 384 | if(handle == -2) |
385 | printf("%s handle %d\n", __FUNCTION__, handle); |
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386 | |||
3260 | Serge | 387 | spin_lock(&filp->table_lock); |
388 | |||
389 | /* Check if we currently have a reference on the object */ |
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390 | obj = idr_find(&filp->object_idr, handle); |
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391 | if (obj == NULL) { |
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392 | spin_unlock(&filp->table_lock); |
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393 | return NULL; |
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394 | } |
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395 | |||
396 | drm_gem_object_reference(obj); |
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397 | |||
398 | spin_unlock(&filp->table_lock); |
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399 | |||
400 | return obj; |
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401 | } |
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402 | EXPORT_SYMBOL(drm_gem_object_lookup); |
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403 | |||
404 | /** |
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405 | * Releases the handle to an mm object. |
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406 | */ |
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407 | int |
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408 | drm_gem_close_ioctl(struct drm_device *dev, void *data, |
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409 | struct drm_file *file_priv) |
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410 | { |
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411 | struct drm_gem_close *args = data; |
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412 | int ret; |
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413 | |||
414 | ret = drm_gem_handle_delete(file_priv, args->handle); |
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415 | |||
416 | return ret; |
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417 | } |
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418 | |||
419 | /** |
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420 | * Create a global name for an object, returning the name. |
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421 | * |
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422 | * Note that the name does not hold a reference; when the object |
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423 | * is freed, the name goes away. |
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424 | */ |
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425 | |||
426 | #if 0 |
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427 | int |
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428 | drm_gem_flink_ioctl(struct drm_device *dev, void *data, |
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429 | struct drm_file *file_priv) |
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430 | { |
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431 | struct drm_gem_flink *args = data; |
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432 | struct drm_gem_object *obj; |
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433 | int ret; |
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434 | |||
435 | if (!(dev->driver->driver_features & DRIVER_GEM)) |
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436 | return -ENODEV; |
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437 | |||
438 | obj = drm_gem_object_lookup(dev, file_priv, args->handle); |
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439 | if (obj == NULL) |
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440 | return -ENOENT; |
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441 | |||
3480 | Serge | 442 | idr_preload(GFP_KERNEL); |
3260 | Serge | 443 | spin_lock(&dev->object_name_lock); |
444 | if (!obj->name) { |
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3480 | Serge | 445 | ret = idr_alloc(&dev->object_name_idr, obj, 1, 0, GFP_NOWAIT); |
446 | if (ret < 0) |
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3260 | Serge | 447 | goto err; |
448 | |||
4075 | Serge | 449 | obj->name = ret; |
450 | |||
3260 | Serge | 451 | /* Allocate a reference for the name table. */ |
452 | drm_gem_object_reference(obj); |
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4075 | Serge | 453 | } |
454 | |||
3260 | Serge | 455 | args->name = (uint64_t) obj->name; |
456 | ret = 0; |
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457 | |||
458 | err: |
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4075 | Serge | 459 | spin_unlock(&dev->object_name_lock); |
460 | idr_preload_end(); |
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3260 | Serge | 461 | drm_gem_object_unreference_unlocked(obj); |
462 | return ret; |
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463 | } |
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464 | |||
465 | /** |
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466 | * Open an object using the global name, returning a handle and the size. |
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467 | * |
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468 | * This handle (of course) holds a reference to the object, so the object |
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469 | * will not go away until the handle is deleted. |
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470 | */ |
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471 | int |
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472 | drm_gem_open_ioctl(struct drm_device *dev, void *data, |
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473 | struct drm_file *file_priv) |
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474 | { |
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475 | struct drm_gem_open *args = data; |
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476 | struct drm_gem_object *obj; |
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477 | int ret; |
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478 | u32 handle; |
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479 | |||
480 | if (!(dev->driver->driver_features & DRIVER_GEM)) |
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481 | return -ENODEV; |
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482 | |||
3480 | Serge | 483 | if(handle == -2) |
484 | printf("%s handle %d\n", __FUNCTION__, handle); |
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485 | |||
3260 | Serge | 486 | spin_lock(&dev->object_name_lock); |
487 | obj = idr_find(&dev->object_name_idr, (int) args->name); |
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488 | if (obj) |
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489 | drm_gem_object_reference(obj); |
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490 | spin_unlock(&dev->object_name_lock); |
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491 | if (!obj) |
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492 | return -ENOENT; |
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493 | |||
494 | ret = drm_gem_handle_create(file_priv, obj, &handle); |
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495 | drm_gem_object_unreference_unlocked(obj); |
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496 | if (ret) |
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497 | return ret; |
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498 | |||
499 | args->handle = handle; |
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500 | args->size = obj->size; |
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501 | |||
502 | return 0; |
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503 | } |
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504 | |||
505 | /** |
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506 | * Called at device open time, sets up the structure for handling refcounting |
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507 | * of mm objects. |
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508 | */ |
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509 | void |
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510 | drm_gem_open(struct drm_device *dev, struct drm_file *file_private) |
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511 | { |
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512 | idr_init(&file_private->object_idr); |
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513 | spin_lock_init(&file_private->table_lock); |
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514 | } |
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515 | |||
516 | /** |
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517 | * Called at device close to release the file's |
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518 | * handle references on objects. |
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519 | */ |
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520 | static int |
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521 | drm_gem_object_release_handle(int id, void *ptr, void *data) |
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522 | { |
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523 | struct drm_file *file_priv = data; |
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524 | struct drm_gem_object *obj = ptr; |
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525 | struct drm_device *dev = obj->dev; |
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526 | |||
527 | drm_gem_remove_prime_handles(obj, file_priv); |
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528 | |||
529 | if (dev->driver->gem_close_object) |
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530 | dev->driver->gem_close_object(obj, file_priv); |
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531 | |||
532 | drm_gem_object_handle_unreference_unlocked(obj); |
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533 | |||
534 | return 0; |
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535 | } |
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536 | |||
537 | /** |
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538 | * Called at close time when the filp is going away. |
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539 | * |
||
540 | * Releases any remaining references on objects by this filp. |
||
541 | */ |
||
542 | void |
||
543 | drm_gem_release(struct drm_device *dev, struct drm_file *file_private) |
||
544 | { |
||
545 | idr_for_each(&file_private->object_idr, |
||
546 | &drm_gem_object_release_handle, file_private); |
||
547 | idr_destroy(&file_private->object_idr); |
||
548 | } |
||
549 | #endif |
||
550 | |||
551 | void |
||
552 | drm_gem_object_release(struct drm_gem_object *obj) |
||
553 | { |
||
554 | if (obj->filp) |
||
555 | free(obj->filp); |
||
556 | } |
||
557 | EXPORT_SYMBOL(drm_gem_object_release); |
||
558 | |||
559 | /** |
||
560 | * Called after the last reference to the object has been lost. |
||
561 | * Must be called holding struct_ mutex |
||
562 | * |
||
563 | * Frees the object |
||
564 | */ |
||
565 | void |
||
566 | drm_gem_object_free(struct kref *kref) |
||
567 | { |
||
568 | struct drm_gem_object *obj = (struct drm_gem_object *) kref; |
||
569 | struct drm_device *dev = obj->dev; |
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570 | |||
571 | BUG_ON(!mutex_is_locked(&dev->struct_mutex)); |
||
572 | |||
573 | if (dev->driver->gem_free_object != NULL) |
||
574 | dev->driver->gem_free_object(obj); |
||
575 | } |
||
576 | EXPORT_SYMBOL(drm_gem_object_free); |
||
577 | |||
578 | static void drm_gem_object_ref_bug(struct kref *list_kref) |
||
579 | { |
||
580 | BUG(); |
||
581 | } |
||
582 | |||
583 | /** |
||
584 | * Called after the last handle to the object has been closed |
||
585 | * |
||
586 | * Removes any name for the object. Note that this must be |
||
587 | * called before drm_gem_object_free or we'll be touching |
||
588 | * freed memory |
||
589 | */ |
||
590 | void drm_gem_object_handle_free(struct drm_gem_object *obj) |
||
591 | { |
||
592 | struct drm_device *dev = obj->dev; |
||
593 | |||
594 | /* Remove any name for this object */ |
||
595 | spin_lock(&dev->object_name_lock); |
||
596 | if (obj->name) { |
||
597 | idr_remove(&dev->object_name_idr, obj->name); |
||
598 | obj->name = 0; |
||
599 | spin_unlock(&dev->object_name_lock); |
||
600 | /* |
||
601 | * The object name held a reference to this object, drop |
||
602 | * that now. |
||
603 | * |
||
604 | * This cannot be the last reference, since the handle holds one too. |
||
605 | */ |
||
606 | kref_put(&obj->refcount, drm_gem_object_ref_bug); |
||
607 | } else |
||
608 | spin_unlock(&dev->object_name_lock); |
||
609 | |||
610 | } |
||
611 | EXPORT_SYMBOL(drm_gem_object_handle_free); |
||
612 | |||
613 | #if 0 |
||
614 | void drm_gem_vm_open(struct vm_area_struct *vma) |
||
615 | { |
||
616 | struct drm_gem_object *obj = vma->vm_private_data; |
||
617 | |||
618 | drm_gem_object_reference(obj); |
||
619 | |||
620 | mutex_lock(&obj->dev->struct_mutex); |
||
621 | drm_vm_open_locked(obj->dev, vma); |
||
622 | mutex_unlock(&obj->dev->struct_mutex); |
||
623 | } |
||
624 | EXPORT_SYMBOL(drm_gem_vm_open); |
||
625 | |||
626 | void drm_gem_vm_close(struct vm_area_struct *vma) |
||
627 | { |
||
628 | struct drm_gem_object *obj = vma->vm_private_data; |
||
629 | struct drm_device *dev = obj->dev; |
||
630 | |||
631 | mutex_lock(&dev->struct_mutex); |
||
632 | drm_vm_close_locked(obj->dev, vma); |
||
633 | drm_gem_object_unreference(obj); |
||
634 | mutex_unlock(&dev->struct_mutex); |
||
635 | } |
||
636 | EXPORT_SYMBOL(drm_gem_vm_close); |
||
637 | |||
638 | #endif>> |
||
639 |