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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 CW |
34 | static bool |
35 | mark_free(struct drm_i915_gem_object *obj_priv, | |
36 | struct list_head *unwind) | |
b47eb4a2 | 37 | { |
cd377ea9 | 38 | list_add(&obj_priv->evict_list, unwind); |
af626103 | 39 | drm_gem_object_reference(&obj_priv->base); |
cd377ea9 | 40 | return drm_mm_scan_add_block(obj_priv->gtt_space); |
b47eb4a2 CW |
41 | } |
42 | ||
43 | int | |
cd377ea9 | 44 | i915_gem_evict_something(struct drm_device *dev, int min_size, unsigned alignment) |
b47eb4a2 CW |
45 | { |
46 | drm_i915_private_t *dev_priv = dev->dev_private; | |
cd377ea9 | 47 | struct list_head eviction_list, unwind_list; |
e39a0150 | 48 | struct drm_i915_gem_object *obj_priv; |
cd377ea9 | 49 | int ret = 0; |
b47eb4a2 | 50 | |
cd377ea9 | 51 | i915_gem_retire_requests(dev); |
b47eb4a2 | 52 | |
cd377ea9 CW |
53 | /* Re-check for free space after retiring requests */ |
54 | if (drm_mm_search_free(&dev_priv->mm.gtt_space, | |
55 | min_size, alignment, 0)) | |
56 | return 0; | |
b47eb4a2 | 57 | |
cd377ea9 CW |
58 | /* |
59 | * The goal is to evict objects and amalgamate space in LRU order. | |
60 | * The oldest idle objects reside on the inactive list, which is in | |
61 | * retirement order. The next objects to retire are those on the (per | |
62 | * ring) active list that do not have an outstanding flush. Once the | |
63 | * hardware reports completion (the seqno is updated after the | |
64 | * batchbuffer has been finished) the clean buffer objects would | |
65 | * be retired to the inactive list. Any dirty objects would be added | |
66 | * to the tail of the flushing list. So after processing the clean | |
67 | * active objects we need to emit a MI_FLUSH to retire the flushing | |
68 | * list, hence the retirement order of the flushing list is in | |
69 | * advance of the dirty objects on the active lists. | |
70 | * | |
71 | * The retirement sequence is thus: | |
72 | * 1. Inactive objects (already retired) | |
73 | * 2. Clean active objects | |
74 | * 3. Flushing list | |
75 | * 4. Dirty active objects. | |
76 | * | |
77 | * On each list, the oldest objects lie at the HEAD with the freshest | |
78 | * object on the TAIL. | |
79 | */ | |
80 | ||
81 | INIT_LIST_HEAD(&unwind_list); | |
82 | drm_mm_init_scan(&dev_priv->mm.gtt_space, min_size, alignment); | |
83 | ||
84 | /* First see if there is a large enough contiguous idle region... */ | |
69dc4987 | 85 | list_for_each_entry(obj_priv, &dev_priv->mm.inactive_list, mm_list) { |
cd377ea9 CW |
86 | if (mark_free(obj_priv, &unwind_list)) |
87 | goto found; | |
88 | } | |
b47eb4a2 | 89 | |
cd377ea9 | 90 | /* Now merge in the soon-to-be-expired objects... */ |
69dc4987 | 91 | list_for_each_entry(obj_priv, &dev_priv->mm.active_list, mm_list) { |
cd377ea9 CW |
92 | /* Does the object require an outstanding flush? */ |
93 | if (obj_priv->base.write_domain || obj_priv->pin_count) | |
b47eb4a2 | 94 | continue; |
b47eb4a2 | 95 | |
cd377ea9 CW |
96 | if (mark_free(obj_priv, &unwind_list)) |
97 | goto found; | |
98 | } | |
b47eb4a2 | 99 | |
cd377ea9 | 100 | /* Finally add anything with a pending flush (in order of retirement) */ |
69dc4987 | 101 | list_for_each_entry(obj_priv, &dev_priv->mm.flushing_list, mm_list) { |
cd377ea9 CW |
102 | if (obj_priv->pin_count) |
103 | continue; | |
b47eb4a2 | 104 | |
cd377ea9 CW |
105 | if (mark_free(obj_priv, &unwind_list)) |
106 | goto found; | |
107 | } | |
69dc4987 | 108 | list_for_each_entry(obj_priv, &dev_priv->mm.active_list, mm_list) { |
cd377ea9 | 109 | if (! obj_priv->base.write_domain || obj_priv->pin_count) |
b47eb4a2 | 110 | continue; |
b47eb4a2 | 111 | |
cd377ea9 CW |
112 | if (mark_free(obj_priv, &unwind_list)) |
113 | goto found; | |
114 | } | |
115 | ||
116 | /* Nothing found, clean up and bail out! */ | |
117 | list_for_each_entry(obj_priv, &unwind_list, evict_list) { | |
118 | ret = drm_mm_scan_remove_block(obj_priv->gtt_space); | |
119 | BUG_ON(ret); | |
af626103 | 120 | drm_gem_object_unreference(&obj_priv->base); |
cd377ea9 CW |
121 | } |
122 | ||
123 | /* We expect the caller to unpin, evict all and try again, or give up. | |
124 | * So calling i915_gem_evict_everything() is unnecessary. | |
125 | */ | |
126 | return -ENOSPC; | |
127 | ||
128 | found: | |
e39a0150 CW |
129 | /* drm_mm doesn't allow any other other operations while |
130 | * scanning, therefore store to be evicted objects on a | |
131 | * temporary list. */ | |
cd377ea9 | 132 | INIT_LIST_HEAD(&eviction_list); |
e39a0150 CW |
133 | while (!list_empty(&unwind_list)) { |
134 | obj_priv = list_first_entry(&unwind_list, | |
135 | struct drm_i915_gem_object, | |
136 | evict_list); | |
cd377ea9 | 137 | if (drm_mm_scan_remove_block(obj_priv->gtt_space)) { |
cd377ea9 | 138 | list_move(&obj_priv->evict_list, &eviction_list); |
e39a0150 CW |
139 | continue; |
140 | } | |
141 | list_del(&obj_priv->evict_list); | |
142 | drm_gem_object_unreference(&obj_priv->base); | |
cd377ea9 | 143 | } |
b47eb4a2 | 144 | |
cd377ea9 | 145 | /* Unbinding will emit any required flushes */ |
e39a0150 CW |
146 | while (!list_empty(&eviction_list)) { |
147 | obj_priv = list_first_entry(&eviction_list, | |
148 | struct drm_i915_gem_object, | |
149 | evict_list); | |
150 | if (ret == 0) | |
151 | ret = i915_gem_object_unbind(&obj_priv->base); | |
152 | list_del(&obj_priv->evict_list); | |
af626103 | 153 | drm_gem_object_unreference(&obj_priv->base); |
b47eb4a2 | 154 | } |
cd377ea9 | 155 | |
e39a0150 | 156 | return ret; |
b47eb4a2 CW |
157 | } |
158 | ||
159 | int | |
160 | i915_gem_evict_everything(struct drm_device *dev) | |
161 | { | |
162 | drm_i915_private_t *dev_priv = dev->dev_private; | |
163 | int ret; | |
164 | bool lists_empty; | |
165 | ||
b47eb4a2 CW |
166 | lists_empty = (list_empty(&dev_priv->mm.inactive_list) && |
167 | list_empty(&dev_priv->mm.flushing_list) && | |
395b70be | 168 | list_empty(&dev_priv->mm.active_list)); |
b47eb4a2 CW |
169 | if (lists_empty) |
170 | return -ENOSPC; | |
171 | ||
172 | /* Flush everything (on to the inactive lists) and evict */ | |
173 | ret = i915_gpu_idle(dev); | |
174 | if (ret) | |
175 | return ret; | |
176 | ||
177 | BUG_ON(!list_empty(&dev_priv->mm.flushing_list)); | |
178 | ||
179 | ret = i915_gem_evict_inactive(dev); | |
180 | if (ret) | |
181 | return ret; | |
182 | ||
b47eb4a2 CW |
183 | lists_empty = (list_empty(&dev_priv->mm.inactive_list) && |
184 | list_empty(&dev_priv->mm.flushing_list) && | |
395b70be | 185 | list_empty(&dev_priv->mm.active_list)); |
b47eb4a2 CW |
186 | BUG_ON(!lists_empty); |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | /** Unbinds all inactive objects. */ | |
192 | int | |
193 | i915_gem_evict_inactive(struct drm_device *dev) | |
194 | { | |
195 | drm_i915_private_t *dev_priv = dev->dev_private; | |
196 | ||
197 | while (!list_empty(&dev_priv->mm.inactive_list)) { | |
198 | struct drm_gem_object *obj; | |
199 | int ret; | |
200 | ||
201 | obj = &list_first_entry(&dev_priv->mm.inactive_list, | |
202 | struct drm_i915_gem_object, | |
69dc4987 | 203 | mm_list)->base; |
b47eb4a2 CW |
204 | |
205 | ret = i915_gem_object_unbind(obj); | |
206 | if (ret != 0) { | |
207 | DRM_ERROR("Error unbinding object: %d\n", ret); | |
208 | return ret; | |
209 | } | |
210 | } | |
211 | ||
212 | return 0; | |
213 | } |