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b47eb4a2 CW |
1 | /* |
2 | * Copyright © 2008-2010 Intel Corporation | |
3 | * | |
4 | * Permission is hereby granted, free of charge, to any person obtaining a | |
5 | * copy of this software and associated documentation files (the "Software"), | |
6 | * to deal in the Software without restriction, including without limitation | |
7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
8 | * and/or sell copies of the Software, and to permit persons to whom the | |
9 | * Software is furnished to do so, subject to the following conditions: | |
10 | * | |
11 | * The above copyright notice and this permission notice (including the next | |
12 | * paragraph) shall be included in all copies or substantial portions of the | |
13 | * Software. | |
14 | * | |
15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
21 | * IN THE SOFTWARE. | |
22 | * | |
23 | * Authors: | |
24 | * Eric Anholt <eric@anholt.net> | |
25 | * Chris Wilson <chris@chris-wilson.co.uuk> | |
26 | * | |
27 | */ | |
28 | ||
29 | #include "drmP.h" | |
30 | #include "drm.h" | |
31 | #include "i915_drv.h" | |
32 | #include "i915_drm.h" | |
33 | ||
cd377ea9 | 34 | static bool |
05394f39 | 35 | mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind) |
b47eb4a2 | 36 | { |
05394f39 CW |
37 | list_add(&obj->evict_list, unwind); |
38 | drm_gem_object_reference(&obj->base); | |
39 | return drm_mm_scan_add_block(obj->gtt_space); | |
b47eb4a2 CW |
40 | } |
41 | ||
42 | int | |
a6e0aa42 | 43 | i915_gem_evict_something(struct drm_device *dev, int min_size, |
5eac3ab4 | 44 | unsigned alignment, bool mappable) |
b47eb4a2 CW |
45 | { |
46 | drm_i915_private_t *dev_priv = dev->dev_private; | |
cd377ea9 | 47 | struct list_head eviction_list, unwind_list; |
05394f39 | 48 | struct drm_i915_gem_object *obj; |
cd377ea9 | 49 | int ret = 0; |
b47eb4a2 | 50 | |
cd377ea9 | 51 | i915_gem_retire_requests(dev); |
b47eb4a2 | 52 | |
cd377ea9 | 53 | /* Re-check for free space after retiring requests */ |
a6e0aa42 DV |
54 | if (mappable) { |
55 | if (drm_mm_search_free_in_range(&dev_priv->mm.gtt_space, | |
5eac3ab4 | 56 | min_size, alignment, 0, |
a6e0aa42 DV |
57 | dev_priv->mm.gtt_mappable_end, |
58 | 0)) | |
59 | return 0; | |
60 | } else { | |
61 | if (drm_mm_search_free(&dev_priv->mm.gtt_space, | |
62 | min_size, alignment, 0)) | |
63 | return 0; | |
64 | } | |
b47eb4a2 | 65 | |
cd377ea9 CW |
66 | /* |
67 | * The goal is to evict objects and amalgamate space in LRU order. | |
68 | * The oldest idle objects reside on the inactive list, which is in | |
69 | * retirement order. The next objects to retire are those on the (per | |
70 | * ring) active list that do not have an outstanding flush. Once the | |
71 | * hardware reports completion (the seqno is updated after the | |
72 | * batchbuffer has been finished) the clean buffer objects would | |
73 | * be retired to the inactive list. Any dirty objects would be added | |
74 | * to the tail of the flushing list. So after processing the clean | |
75 | * active objects we need to emit a MI_FLUSH to retire the flushing | |
76 | * list, hence the retirement order of the flushing list is in | |
77 | * advance of the dirty objects on the active lists. | |
78 | * | |
79 | * The retirement sequence is thus: | |
80 | * 1. Inactive objects (already retired) | |
81 | * 2. Clean active objects | |
82 | * 3. Flushing list | |
83 | * 4. Dirty active objects. | |
84 | * | |
85 | * On each list, the oldest objects lie at the HEAD with the freshest | |
86 | * object on the TAIL. | |
87 | */ | |
88 | ||
89 | INIT_LIST_HEAD(&unwind_list); | |
a6e0aa42 DV |
90 | if (mappable) |
91 | drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, min_size, | |
92 | alignment, 0, | |
93 | dev_priv->mm.gtt_mappable_end); | |
94 | else | |
95 | drm_mm_init_scan(&dev_priv->mm.gtt_space, min_size, alignment); | |
cd377ea9 CW |
96 | |
97 | /* First see if there is a large enough contiguous idle region... */ | |
05394f39 CW |
98 | list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) { |
99 | if (mark_free(obj, &unwind_list)) | |
cd377ea9 CW |
100 | goto found; |
101 | } | |
b47eb4a2 | 102 | |
cd377ea9 | 103 | /* Now merge in the soon-to-be-expired objects... */ |
05394f39 | 104 | list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) { |
cd377ea9 | 105 | /* Does the object require an outstanding flush? */ |
05394f39 | 106 | if (obj->base.write_domain || obj->pin_count) |
b47eb4a2 | 107 | continue; |
b47eb4a2 | 108 | |
05394f39 | 109 | if (mark_free(obj, &unwind_list)) |
cd377ea9 CW |
110 | goto found; |
111 | } | |
b47eb4a2 | 112 | |
cd377ea9 | 113 | /* Finally add anything with a pending flush (in order of retirement) */ |
05394f39 CW |
114 | list_for_each_entry(obj, &dev_priv->mm.flushing_list, mm_list) { |
115 | if (obj->pin_count) | |
cd377ea9 | 116 | continue; |
b47eb4a2 | 117 | |
05394f39 | 118 | if (mark_free(obj, &unwind_list)) |
cd377ea9 CW |
119 | goto found; |
120 | } | |
05394f39 CW |
121 | list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) { |
122 | if (! obj->base.write_domain || obj->pin_count) | |
b47eb4a2 | 123 | continue; |
b47eb4a2 | 124 | |
05394f39 | 125 | if (mark_free(obj, &unwind_list)) |
cd377ea9 CW |
126 | goto found; |
127 | } | |
128 | ||
129 | /* Nothing found, clean up and bail out! */ | |
05394f39 CW |
130 | list_for_each_entry(obj, &unwind_list, evict_list) { |
131 | ret = drm_mm_scan_remove_block(obj->gtt_space); | |
cd377ea9 | 132 | BUG_ON(ret); |
05394f39 | 133 | drm_gem_object_unreference(&obj->base); |
cd377ea9 CW |
134 | } |
135 | ||
136 | /* We expect the caller to unpin, evict all and try again, or give up. | |
137 | * So calling i915_gem_evict_everything() is unnecessary. | |
138 | */ | |
139 | return -ENOSPC; | |
140 | ||
141 | found: | |
e39a0150 CW |
142 | /* drm_mm doesn't allow any other other operations while |
143 | * scanning, therefore store to be evicted objects on a | |
144 | * temporary list. */ | |
cd377ea9 | 145 | INIT_LIST_HEAD(&eviction_list); |
e39a0150 | 146 | while (!list_empty(&unwind_list)) { |
05394f39 CW |
147 | obj = list_first_entry(&unwind_list, |
148 | struct drm_i915_gem_object, | |
149 | evict_list); | |
150 | if (drm_mm_scan_remove_block(obj->gtt_space)) { | |
151 | list_move(&obj->evict_list, &eviction_list); | |
e39a0150 CW |
152 | continue; |
153 | } | |
05394f39 CW |
154 | list_del(&obj->evict_list); |
155 | drm_gem_object_unreference(&obj->base); | |
cd377ea9 | 156 | } |
b47eb4a2 | 157 | |
cd377ea9 | 158 | /* Unbinding will emit any required flushes */ |
e39a0150 | 159 | while (!list_empty(&eviction_list)) { |
05394f39 CW |
160 | obj = list_first_entry(&eviction_list, |
161 | struct drm_i915_gem_object, | |
162 | evict_list); | |
e39a0150 | 163 | if (ret == 0) |
05394f39 CW |
164 | ret = i915_gem_object_unbind(obj); |
165 | list_del(&obj->evict_list); | |
166 | drm_gem_object_unreference(&obj->base); | |
b47eb4a2 | 167 | } |
cd377ea9 | 168 | |
e39a0150 | 169 | return ret; |
b47eb4a2 CW |
170 | } |
171 | ||
172 | int | |
5eac3ab4 | 173 | i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only) |
b47eb4a2 CW |
174 | { |
175 | drm_i915_private_t *dev_priv = dev->dev_private; | |
176 | int ret; | |
177 | bool lists_empty; | |
178 | ||
b47eb4a2 CW |
179 | lists_empty = (list_empty(&dev_priv->mm.inactive_list) && |
180 | list_empty(&dev_priv->mm.flushing_list) && | |
395b70be | 181 | list_empty(&dev_priv->mm.active_list)); |
b47eb4a2 CW |
182 | if (lists_empty) |
183 | return -ENOSPC; | |
184 | ||
185 | /* Flush everything (on to the inactive lists) and evict */ | |
186 | ret = i915_gpu_idle(dev); | |
187 | if (ret) | |
188 | return ret; | |
189 | ||
190 | BUG_ON(!list_empty(&dev_priv->mm.flushing_list)); | |
191 | ||
5eac3ab4 | 192 | return i915_gem_evict_inactive(dev, purgeable_only); |
b47eb4a2 CW |
193 | } |
194 | ||
195 | /** Unbinds all inactive objects. */ | |
196 | int | |
5eac3ab4 | 197 | i915_gem_evict_inactive(struct drm_device *dev, bool purgeable_only) |
b47eb4a2 CW |
198 | { |
199 | drm_i915_private_t *dev_priv = dev->dev_private; | |
5eac3ab4 CW |
200 | struct drm_i915_gem_object *obj, *next; |
201 | ||
202 | list_for_each_entry_safe(obj, next, | |
203 | &dev_priv->mm.inactive_list, mm_list) { | |
204 | if (!purgeable_only || obj->madv != I915_MADV_WILLNEED) { | |
05394f39 | 205 | int ret = i915_gem_object_unbind(obj); |
5eac3ab4 CW |
206 | if (ret) |
207 | return ret; | |
b47eb4a2 CW |
208 | } |
209 | } | |
210 | ||
211 | return 0; | |
212 | } |