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 #include "i915_trace.h"
34
35 static bool
mark_free(struct drm_i915_gem_object * obj,struct list_head * unwind)36 mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind)
37 {
38 list_add(&obj->exec_list, unwind);
39 return drm_mm_scan_add_block(obj->gtt_space);
40 }
41
42 int
i915_gem_evict_something(struct drm_device * dev,int min_size,unsigned alignment,bool mappable)43 i915_gem_evict_something(struct drm_device *dev, int min_size,
44 unsigned alignment, bool mappable)
45 {
46 drm_i915_private_t *dev_priv = dev->dev_private;
47 struct list_head eviction_list, unwind_list;
48 struct drm_i915_gem_object *obj;
49 int ret = 0;
50
51 trace_i915_gem_evict(dev, min_size, alignment, mappable);
52
53 /*
54 * The goal is to evict objects and amalgamate space in LRU order.
55 * The oldest idle objects reside on the inactive list, which is in
56 * retirement order. The next objects to retire are those on the (per
57 * ring) active list that do not have an outstanding flush. Once the
58 * hardware reports completion (the seqno is updated after the
59 * batchbuffer has been finished) the clean buffer objects would
60 * be retired to the inactive list. Any dirty objects would be added
61 * to the tail of the flushing list. So after processing the clean
62 * active objects we need to emit a MI_FLUSH to retire the flushing
63 * list, hence the retirement order of the flushing list is in
64 * advance of the dirty objects on the active lists.
65 *
66 * The retirement sequence is thus:
67 * 1. Inactive objects (already retired)
68 * 2. Clean active objects
69 * 3. Flushing list
70 * 4. Dirty active objects.
71 *
72 * On each list, the oldest objects lie at the HEAD with the freshest
73 * object on the TAIL.
74 */
75
76 INIT_LIST_HEAD(&unwind_list);
77 if (mappable)
78 drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, min_size,
79 alignment, 0,
80 dev_priv->mm.gtt_mappable_end);
81 else
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... */
85 list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) {
86 if (mark_free(obj, &unwind_list))
87 goto found;
88 }
89
90 /* Now merge in the soon-to-be-expired objects... */
91 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
92 /* Does the object require an outstanding flush? */
93 if (obj->base.write_domain || obj->pin_count)
94 continue;
95
96 if (mark_free(obj, &unwind_list))
97 goto found;
98 }
99
100 /* Finally add anything with a pending flush (in order of retirement) */
101 list_for_each_entry(obj, &dev_priv->mm.flushing_list, mm_list) {
102 if (obj->pin_count)
103 continue;
104
105 if (mark_free(obj, &unwind_list))
106 goto found;
107 }
108 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
109 if (!obj->base.write_domain || obj->pin_count)
110 continue;
111
112 if (mark_free(obj, &unwind_list))
113 goto found;
114 }
115
116 /* Nothing found, clean up and bail out! */
117 while (!list_empty(&unwind_list)) {
118 obj = list_first_entry(&unwind_list,
119 struct drm_i915_gem_object,
120 exec_list);
121
122 ret = drm_mm_scan_remove_block(obj->gtt_space);
123 BUG_ON(ret);
124
125 list_del_init(&obj->exec_list);
126 }
127
128 /* We expect the caller to unpin, evict all and try again, or give up.
129 * So calling i915_gem_evict_everything() is unnecessary.
130 */
131 return -ENOSPC;
132
133 found:
134 /* drm_mm doesn't allow any other other operations while
135 * scanning, therefore store to be evicted objects on a
136 * temporary list. */
137 INIT_LIST_HEAD(&eviction_list);
138 while (!list_empty(&unwind_list)) {
139 obj = list_first_entry(&unwind_list,
140 struct drm_i915_gem_object,
141 exec_list);
142 if (drm_mm_scan_remove_block(obj->gtt_space)) {
143 list_move(&obj->exec_list, &eviction_list);
144 drm_gem_object_reference(&obj->base);
145 continue;
146 }
147 list_del_init(&obj->exec_list);
148 }
149
150 /* Unbinding will emit any required flushes */
151 while (!list_empty(&eviction_list)) {
152 obj = list_first_entry(&eviction_list,
153 struct drm_i915_gem_object,
154 exec_list);
155 if (ret == 0)
156 ret = i915_gem_object_unbind(obj);
157
158 list_del_init(&obj->exec_list);
159 drm_gem_object_unreference(&obj->base);
160 }
161
162 return ret;
163 }
164
165 int
i915_gem_evict_everything(struct drm_device * dev,bool purgeable_only)166 i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only)
167 {
168 drm_i915_private_t *dev_priv = dev->dev_private;
169 int ret;
170 bool lists_empty;
171
172 lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
173 list_empty(&dev_priv->mm.flushing_list) &&
174 list_empty(&dev_priv->mm.active_list));
175 if (lists_empty)
176 return -ENOSPC;
177
178 trace_i915_gem_evict_everything(dev, purgeable_only);
179
180 /* Flush everything (on to the inactive lists) and evict */
181 ret = i915_gpu_idle(dev, true);
182 if (ret)
183 return ret;
184
185 BUG_ON(!list_empty(&dev_priv->mm.flushing_list));
186
187 return i915_gem_evict_inactive(dev, purgeable_only);
188 }
189
190 /** Unbinds all inactive objects. */
191 int
i915_gem_evict_inactive(struct drm_device * dev,bool purgeable_only)192 i915_gem_evict_inactive(struct drm_device *dev, bool purgeable_only)
193 {
194 drm_i915_private_t *dev_priv = dev->dev_private;
195 struct drm_i915_gem_object *obj, *next;
196
197 list_for_each_entry_safe(obj, next,
198 &dev_priv->mm.inactive_list, mm_list) {
199 if (!purgeable_only || obj->madv != I915_MADV_WILLNEED) {
200 int ret = i915_gem_object_unbind(obj);
201 if (ret)
202 return ret;
203 }
204 }
205
206 return 0;
207 }
208