1 /*
2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
3 */
4
5 /*
6 * Copyright (c) 2008-2010, 2013 Intel Corporation
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the next
16 * paragraph) shall be included in all copies or substantial portions of the
17 * Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
25 * IN THE SOFTWARE.
26 *
27 * Authors:
28 * Eric Anholt <eric@anholt.net>
29 * Chris Wilson <chris@chris-wilson.co.uuk>
30 *
31 */
32
33 #include "drmP.h"
34 #include "drm.h"
35 #include "i915_drv.h"
36 #include "i915_drm.h"
37
38 static bool
mark_free(struct drm_i915_gem_object * obj,struct list_head * unwind)39 mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind)
40 {
41 if (obj->pin_count)
42 return false;
43
44 list_add(&obj->exec_list, unwind, (caddr_t)obj);
45 return drm_mm_scan_add_block(obj->gtt_space);
46 }
47
48 int
i915_gem_evict_something(struct drm_device * dev,int min_size,unsigned alignment,unsigned cache_level,bool mappable,bool nonblocking)49 i915_gem_evict_something(struct drm_device *dev, int min_size,
50 unsigned alignment, unsigned cache_level,
51 bool mappable, bool nonblocking)
52 {
53 drm_i915_private_t *dev_priv = dev->dev_private;
54 struct list_head eviction_list, unwind_list;
55 struct drm_i915_gem_object *obj;
56 int ret = 0;
57
58
59 /*
60 * The goal is to evict objects and amalgamate space in LRU order.
61 * The oldest idle objects reside on the inactive list, which is in
62 * retirement order. The next objects to retire are those on the (per
63 * ring) active list that do not have an outstanding flush. Once the
64 * hardware reports completion (the seqno is updated after the
65 * batchbuffer has been finished) the clean buffer objects would
66 * be retired to the inactive list. Any dirty objects would be added
67 * to the tail of the flushing list. So after processing the clean
68 * active objects we need to emit a MI_FLUSH to retire the flushing
69 * list, hence the retirement order of the flushing list is in
70 * advance of the dirty objects on the active lists.
71 *
72 * The retirement sequence is thus:
73 * 1. Inactive objects (already retired)
74 * 2. Clean active objects
75 * 3. Flushing list
76 * 4. Dirty active objects.
77 *
78 * On each list, the oldest objects lie at the HEAD with the freshest
79 * object on the TAIL.
80 */
81
82 INIT_LIST_HEAD(&unwind_list);
83 if (mappable)
84 drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space,
85 min_size, alignment, cache_level,
86 0, dev_priv->gtt.mappable_end);
87 else
88 drm_mm_init_scan(&dev_priv->mm.gtt_space,
89 min_size, alignment, cache_level);
90
91 /* First see if there is a large enough contiguous idle region... */
92 list_for_each_entry(obj, struct drm_i915_gem_object, &dev_priv->mm.inactive_list, mm_list) {
93 if (mark_free(obj, &unwind_list))
94 goto found;
95 }
96
97 if (nonblocking)
98 goto none;
99
100 /* Now merge in the soon-to-be-expired objects... */
101 list_for_each_entry(obj, struct drm_i915_gem_object, &dev_priv->mm.active_list, mm_list) {
102 if (mark_free(obj, &unwind_list))
103 goto found;
104 }
105
106 none:
107 /* Nothing found, clean up and bail out! */
108 while (!list_empty(&unwind_list)) {
109 obj = list_first_entry(&unwind_list,
110 struct drm_i915_gem_object,
111 exec_list);
112
113 ret = drm_mm_scan_remove_block(obj->gtt_space);
114 BUG_ON(ret);
115
116 list_del_init(&obj->exec_list);
117 }
118
119 /* We expect the caller to unpin, evict all and try again, or give up.
120 * So calling i915_gem_evict_everything() is unnecessary.
121 */
122 return -ENOSPC;
123
124 found:
125 /* drm_mm doesn't allow any other other operations while
126 * scanning, therefore store to be evicted objects on a
127 * temporary list. */
128 INIT_LIST_HEAD(&eviction_list);
129 while (!list_empty(&unwind_list)) {
130 obj = list_first_entry(&unwind_list,
131 struct drm_i915_gem_object,
132 exec_list);
133 if (drm_mm_scan_remove_block(obj->gtt_space)) {
134 list_move(&obj->exec_list, &eviction_list, (caddr_t)obj);
135 drm_gem_object_reference(&obj->base);
136 continue;
137 }
138 list_del_init(&obj->exec_list);
139 }
140
141 /* Unbinding will emit any required flushes */
142 while (!list_empty(&eviction_list)) {
143 obj = list_first_entry(&eviction_list,
144 struct drm_i915_gem_object,
145 exec_list);
146 if (ret == 0)
147 ret = i915_gem_object_unbind(obj, 1);
148 list_del_init(&obj->exec_list);
149 drm_gem_object_unreference(&obj->base);
150 }
151
152 return ret;
153 }
154
155 int
i915_gem_evict_everything(struct drm_device * dev)156 i915_gem_evict_everything(struct drm_device *dev)
157 {
158 drm_i915_private_t *dev_priv = dev->dev_private;
159 struct drm_i915_gem_object *obj, *next;
160 bool lists_empty;
161 int ret;
162
163 lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
164 list_empty(&dev_priv->mm.active_list));
165 if (lists_empty)
166 return -ENOSPC;
167
168 /* The gpu_idle will flush everything in the write domain to the
169 * active list. Then we must move everything off the active list
170 * with retire requests.
171 */
172 ret = i915_gpu_idle(dev);
173 if (ret)
174 return ret;
175
176 i915_gem_retire_requests(dev);
177
178 /* Having flushed everything, unbind() should never raise an error */
179 list_for_each_entry_safe(obj, next, struct drm_i915_gem_object,
180 &dev_priv->mm.inactive_list, mm_list)
181 /* LINTED */
182 if (obj->pin_count == 0)
183 WARN_ON(i915_gem_object_unbind(obj, true));
184
185 return 0;
186 }
187