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5060 | serge | 1 | /* |
2 | * Copyright © 2008-2010 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 | * Chris Wilson |
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26 | * |
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27 | */ |
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28 | |||
29 | #include |
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30 | #include |
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31 | |||
32 | #include "i915_drv.h" |
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33 | #include "intel_drv.h" |
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34 | #include "i915_trace.h" |
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35 | |||
36 | static bool |
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37 | mark_free(struct i915_vma *vma, struct list_head *unwind) |
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38 | { |
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39 | if (vma->pin_count) |
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40 | return false; |
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41 | |||
42 | if (WARN_ON(!list_empty(&vma->exec_list))) |
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43 | return false; |
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44 | |||
45 | list_add(&vma->exec_list, unwind); |
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46 | return drm_mm_scan_add_block(&vma->node); |
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47 | } |
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48 | |||
49 | /** |
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50 | * i915_gem_evict_something - Evict vmas to make room for binding a new one |
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51 | * @dev: drm_device |
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52 | * @vm: address space to evict from |
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6084 | serge | 53 | * @min_size: size of the desired free space |
5060 | serge | 54 | * @alignment: alignment constraint of the desired free space |
55 | * @cache_level: cache_level for the desired space |
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6084 | serge | 56 | * @start: start (inclusive) of the range from which to evict objects |
57 | * @end: end (exclusive) of the range from which to evict objects |
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58 | * @flags: additional flags to control the eviction algorithm |
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5060 | serge | 59 | * |
60 | * This function will try to evict vmas until a free space satisfying the |
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61 | * requirements is found. Callers must check first whether any such hole exists |
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62 | * already before calling this function. |
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63 | * |
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64 | * This function is used by the object/vma binding code. |
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65 | * |
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6084 | serge | 66 | * Since this function is only used to free up virtual address space it only |
67 | * ignores pinned vmas, and not object where the backing storage itself is |
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68 | * pinned. Hence obj->pages_pin_count does not protect against eviction. |
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69 | * |
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5060 | serge | 70 | * To clarify: This is for freeing up virtual address space, not for freeing |
71 | * memory in e.g. the shrinker. |
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72 | */ |
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73 | int |
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74 | i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm, |
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75 | int min_size, unsigned alignment, unsigned cache_level, |
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76 | unsigned long start, unsigned long end, |
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77 | unsigned flags) |
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78 | { |
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79 | struct list_head eviction_list, unwind_list; |
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80 | struct i915_vma *vma; |
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81 | int ret = 0; |
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82 | int pass = 0; |
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83 | |||
84 | trace_i915_gem_evict(dev, min_size, alignment, flags); |
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85 | |||
86 | /* |
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87 | * The goal is to evict objects and amalgamate space in LRU order. |
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88 | * The oldest idle objects reside on the inactive list, which is in |
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89 | * retirement order. The next objects to retire are those on the (per |
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90 | * ring) active list that do not have an outstanding flush. Once the |
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91 | * hardware reports completion (the seqno is updated after the |
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92 | * batchbuffer has been finished) the clean buffer objects would |
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93 | * be retired to the inactive list. Any dirty objects would be added |
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94 | * to the tail of the flushing list. So after processing the clean |
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95 | * active objects we need to emit a MI_FLUSH to retire the flushing |
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96 | * list, hence the retirement order of the flushing list is in |
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97 | * advance of the dirty objects on the active lists. |
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98 | * |
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99 | * The retirement sequence is thus: |
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100 | * 1. Inactive objects (already retired) |
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101 | * 2. Clean active objects |
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102 | * 3. Flushing list |
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103 | * 4. Dirty active objects. |
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104 | * |
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105 | * On each list, the oldest objects lie at the HEAD with the freshest |
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106 | * object on the TAIL. |
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107 | */ |
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108 | |||
109 | INIT_LIST_HEAD(&unwind_list); |
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110 | if (start != 0 || end != vm->total) { |
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111 | drm_mm_init_scan_with_range(&vm->mm, min_size, |
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112 | alignment, cache_level, |
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113 | start, end); |
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114 | } else |
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115 | drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level); |
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116 | |||
117 | search_again: |
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118 | /* First see if there is a large enough contiguous idle region... */ |
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7144 | serge | 119 | list_for_each_entry(vma, &vm->inactive_list, vm_link) { |
5060 | serge | 120 | if (mark_free(vma, &unwind_list)) |
121 | goto found; |
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122 | } |
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123 | |||
124 | if (flags & PIN_NONBLOCK) |
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125 | goto none; |
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126 | |||
127 | /* Now merge in the soon-to-be-expired objects... */ |
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7144 | serge | 128 | list_for_each_entry(vma, &vm->active_list, vm_link) { |
5060 | serge | 129 | if (mark_free(vma, &unwind_list)) |
130 | goto found; |
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131 | } |
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132 | |||
133 | none: |
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134 | /* Nothing found, clean up and bail out! */ |
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135 | while (!list_empty(&unwind_list)) { |
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136 | vma = list_first_entry(&unwind_list, |
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137 | struct i915_vma, |
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138 | exec_list); |
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139 | ret = drm_mm_scan_remove_block(&vma->node); |
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140 | BUG_ON(ret); |
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141 | |||
142 | list_del_init(&vma->exec_list); |
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143 | } |
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144 | |||
145 | /* Can we unpin some objects such as idle hw contents, |
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146 | * or pending flips? |
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147 | */ |
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148 | if (flags & PIN_NONBLOCK) |
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149 | return -ENOSPC; |
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150 | |||
151 | /* Only idle the GPU and repeat the search once */ |
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152 | if (pass++ == 0) { |
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153 | ret = i915_gpu_idle(dev); |
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154 | if (ret) |
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155 | return ret; |
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156 | |||
157 | i915_gem_retire_requests(dev); |
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158 | goto search_again; |
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159 | } |
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160 | |||
161 | /* If we still have pending pageflip completions, drop |
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162 | * back to userspace to give our workqueues time to |
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163 | * acquire our locks and unpin the old scanouts. |
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164 | */ |
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165 | return intel_has_pending_fb_unpin(dev) ? -EAGAIN : -ENOSPC; |
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166 | |||
167 | found: |
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168 | /* drm_mm doesn't allow any other other operations while |
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169 | * scanning, therefore store to be evicted objects on a |
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170 | * temporary list. */ |
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171 | INIT_LIST_HEAD(&eviction_list); |
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172 | while (!list_empty(&unwind_list)) { |
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173 | vma = list_first_entry(&unwind_list, |
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174 | struct i915_vma, |
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175 | exec_list); |
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176 | if (drm_mm_scan_remove_block(&vma->node)) { |
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177 | list_move(&vma->exec_list, &eviction_list); |
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178 | drm_gem_object_reference(&vma->obj->base); |
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179 | continue; |
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180 | } |
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181 | list_del_init(&vma->exec_list); |
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182 | } |
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183 | |||
184 | /* Unbinding will emit any required flushes */ |
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185 | while (!list_empty(&eviction_list)) { |
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186 | struct drm_gem_object *obj; |
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187 | vma = list_first_entry(&eviction_list, |
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188 | struct i915_vma, |
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189 | exec_list); |
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190 | |||
191 | obj = &vma->obj->base; |
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192 | list_del_init(&vma->exec_list); |
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193 | if (ret == 0) |
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194 | ret = i915_vma_unbind(vma); |
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195 | |||
196 | drm_gem_object_unreference(obj); |
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197 | } |
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198 | |||
199 | return ret; |
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200 | } |
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201 | |||
6937 | serge | 202 | int |
203 | i915_gem_evict_for_vma(struct i915_vma *target) |
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204 | { |
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205 | struct drm_mm_node *node, *next; |
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206 | |||
207 | list_for_each_entry_safe(node, next, |
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208 | &target->vm->mm.head_node.node_list, |
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209 | node_list) { |
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210 | struct i915_vma *vma; |
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211 | int ret; |
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212 | |||
213 | if (node->start + node->size <= target->node.start) |
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214 | continue; |
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215 | if (node->start >= target->node.start + target->node.size) |
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216 | break; |
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217 | |||
218 | vma = container_of(node, typeof(*vma), node); |
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219 | |||
220 | if (vma->pin_count) { |
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221 | if (!vma->exec_entry || (vma->pin_count > 1)) |
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222 | /* Object is pinned for some other use */ |
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223 | return -EBUSY; |
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224 | |||
225 | /* We need to evict a buffer in the same batch */ |
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226 | if (vma->exec_entry->flags & EXEC_OBJECT_PINNED) |
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227 | /* Overlapping fixed objects in the same batch */ |
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228 | return -EINVAL; |
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229 | |||
230 | return -ENOSPC; |
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231 | } |
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232 | |||
233 | ret = i915_vma_unbind(vma); |
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234 | if (ret) |
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235 | return ret; |
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236 | } |
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237 | |||
238 | return 0; |
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239 | } |
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240 | |||
5060 | serge | 241 | /** |
242 | * i915_gem_evict_vm - Evict all idle vmas from a vm |
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243 | * @vm: Address space to cleanse |
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244 | * @do_idle: Boolean directing whether to idle first. |
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245 | * |
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246 | * This function evicts all idles vmas from a vm. If all unpinned vmas should be |
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247 | * evicted the @do_idle needs to be set to true. |
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248 | * |
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249 | * This is used by the execbuf code as a last-ditch effort to defragment the |
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250 | * address space. |
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251 | * |
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252 | * To clarify: This is for freeing up virtual address space, not for freeing |
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253 | * memory in e.g. the shrinker. |
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254 | */ |
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255 | int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle) |
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256 | { |
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257 | struct i915_vma *vma, *next; |
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258 | int ret; |
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259 | |||
6084 | serge | 260 | WARN_ON(!mutex_is_locked(&vm->dev->struct_mutex)); |
5060 | serge | 261 | trace_i915_gem_evict_vm(vm); |
262 | |||
263 | if (do_idle) { |
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264 | ret = i915_gpu_idle(vm->dev); |
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265 | if (ret) |
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266 | return ret; |
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267 | |||
268 | i915_gem_retire_requests(vm->dev); |
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6084 | serge | 269 | |
270 | WARN_ON(!list_empty(&vm->active_list)); |
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5060 | serge | 271 | } |
272 | |||
7144 | serge | 273 | list_for_each_entry_safe(vma, next, &vm->inactive_list, vm_link) |
5060 | serge | 274 | if (vma->pin_count == 0) |
275 | WARN_ON(i915_vma_unbind(vma)); |
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276 | |||
277 | return 0; |
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278 | }=> |