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 <sys/cdefs.h>
30 __FBSDID("$FreeBSD: stable/9/sys/dev/drm2/i915/i915_gem_evict.c 235783 2012-05-22 11:07:44Z kib $");
31
32 #include <dev/drm2/drmP.h>
33 #include <dev/drm2/drm.h>
34 #include <dev/drm2/i915/i915_drm.h>
35 #include <dev/drm2/i915/i915_drv.h>
36
37 static bool
mark_free(struct drm_i915_gem_object * obj,struct list_head * unwind)38 mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind)
39 {
40 list_add(&obj->exec_list, unwind);
41 return drm_mm_scan_add_block(obj->gtt_space);
42 }
43
44 int
i915_gem_evict_something(struct drm_device * dev,int min_size,unsigned alignment,bool mappable)45 i915_gem_evict_something(struct drm_device *dev, int min_size,
46 unsigned alignment, bool mappable)
47 {
48 drm_i915_private_t *dev_priv = dev->dev_private;
49 struct list_head eviction_list, unwind_list;
50 struct drm_i915_gem_object *obj;
51 int ret = 0;
52
53 CTR4(KTR_DRM, "evict_something %p %d %u %d", dev, min_size,
54 alignment, mappable);
55
56 /*
57 * The goal is to evict objects and amalgamate space in LRU order.
58 * The oldest idle objects reside on the inactive list, which is in
59 * retirement order. The next objects to retire are those on the (per
60 * ring) active list that do not have an outstanding flush. Once the
61 * hardware reports completion (the seqno is updated after the
62 * batchbuffer has been finished) the clean buffer objects would
63 * be retired to the inactive list. Any dirty objects would be added
64 * to the tail of the flushing list. So after processing the clean
65 * active objects we need to emit a MI_FLUSH to retire the flushing
66 * list, hence the retirement order of the flushing list is in
67 * advance of the dirty objects on the active lists.
68 *
69 * The retirement sequence is thus:
70 * 1. Inactive objects (already retired)
71 * 2. Clean active objects
72 * 3. Flushing list
73 * 4. Dirty active objects.
74 *
75 * On each list, the oldest objects lie at the HEAD with the freshest
76 * object on the TAIL.
77 */
78
79 INIT_LIST_HEAD(&unwind_list);
80 if (mappable)
81 drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, min_size,
82 alignment, 0,
83 dev_priv->mm.gtt_mappable_end);
84 else
85 drm_mm_init_scan(&dev_priv->mm.gtt_space, min_size, alignment);
86
87 /* First see if there is a large enough contiguous idle region... */
88 list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) {
89 if (mark_free(obj, &unwind_list))
90 goto found;
91 }
92
93 /* Now merge in the soon-to-be-expired objects... */
94 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
95 /* Does the object require an outstanding flush? */
96 if (obj->base.write_domain || obj->pin_count)
97 continue;
98
99 if (mark_free(obj, &unwind_list))
100 goto found;
101 }
102
103 /* Finally add anything with a pending flush (in order of retirement) */
104 list_for_each_entry(obj, &dev_priv->mm.flushing_list, mm_list) {
105 if (obj->pin_count)
106 continue;
107
108 if (mark_free(obj, &unwind_list))
109 goto found;
110 }
111 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
112 if (!obj->base.write_domain || obj->pin_count)
113 continue;
114
115 if (mark_free(obj, &unwind_list))
116 goto found;
117 }
118
119 /* Nothing found, clean up and bail out! */
120 while (!list_empty(&unwind_list)) {
121 obj = list_first_entry(&unwind_list,
122 struct drm_i915_gem_object,
123 exec_list);
124
125 ret = drm_mm_scan_remove_block(obj->gtt_space);
126 KASSERT(ret == 0, ("drm_mm_scan_remove_block failed %d", ret));
127
128 list_del_init(&obj->exec_list);
129 }
130
131 /* We expect the caller to unpin, evict all and try again, or give up.
132 * So calling i915_gem_evict_everything() is unnecessary.
133 */
134 return -ENOSPC;
135
136 found:
137 /* drm_mm doesn't allow any other other operations while
138 * scanning, therefore store to be evicted objects on a
139 * temporary list. */
140 INIT_LIST_HEAD(&eviction_list);
141 while (!list_empty(&unwind_list)) {
142 obj = list_first_entry(&unwind_list,
143 struct drm_i915_gem_object,
144 exec_list);
145 if (drm_mm_scan_remove_block(obj->gtt_space)) {
146 list_move(&obj->exec_list, &eviction_list);
147 drm_gem_object_reference(&obj->base);
148 continue;
149 }
150 list_del_init(&obj->exec_list);
151 }
152
153 /* Unbinding will emit any required flushes */
154 while (!list_empty(&eviction_list)) {
155 obj = list_first_entry(&eviction_list,
156 struct drm_i915_gem_object,
157 exec_list);
158 if (ret == 0)
159 ret = i915_gem_object_unbind(obj);
160
161 list_del_init(&obj->exec_list);
162 drm_gem_object_unreference(&obj->base);
163 }
164
165 return ret;
166 }
167
168 int
i915_gem_evict_everything(struct drm_device * dev,bool purgeable_only)169 i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only)
170 {
171 drm_i915_private_t *dev_priv = dev->dev_private;
172 int ret;
173 bool lists_empty;
174
175 lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
176 list_empty(&dev_priv->mm.flushing_list) &&
177 list_empty(&dev_priv->mm.active_list));
178 if (lists_empty)
179 return -ENOSPC;
180
181 CTR2(KTR_DRM, "evict_everything %p %d", dev, purgeable_only);
182
183 /* Flush everything (on to the inactive lists) and evict */
184 ret = i915_gpu_idle(dev, true);
185 if (ret)
186 return ret;
187
188 KASSERT(list_empty(&dev_priv->mm.flushing_list),
189 ("flush list not empty"));
190
191 return i915_gem_evict_inactive(dev, purgeable_only);
192 }
193
194 /** Unbinds all inactive objects. */
195 int
i915_gem_evict_inactive(struct drm_device * dev,bool purgeable_only)196 i915_gem_evict_inactive(struct drm_device *dev, bool purgeable_only)
197 {
198 drm_i915_private_t *dev_priv = dev->dev_private;
199 struct drm_i915_gem_object *obj, *next;
200
201 CTR2(KTR_DRM, "evict_inactive %p %d", dev, purgeable_only);
202
203 list_for_each_entry_safe(obj, next,
204 &dev_priv->mm.inactive_list, mm_list) {
205 if (!purgeable_only || obj->madv != I915_MADV_WILLNEED) {
206 int ret = i915_gem_object_unbind(obj);
207 if (ret)
208 return ret;
209 }
210 }
211
212 return 0;
213 }
214