1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
/*
* Copyright © 2008-2010 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Eric Anholt <eric@anholt.net>
* Chris Wilson <chris@chris-wilson.co.uuk>
*
*/
#include "drmP.h"
#include "drm.h"
#include "i915_drv.h"
#include "i915_drm.h"
#include "i915_trace.h"
static bool
mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind)
{
list_add(&obj->exec_list, unwind);
drm_gem_object_reference(&obj->base);
return drm_mm_scan_add_block(obj->gtt_space);
}
int
i915_gem_evict_something(struct drm_device *dev, int min_size,
unsigned alignment, bool mappable)
{
drm_i915_private_t *dev_priv = dev->dev_private;
struct list_head eviction_list, unwind_list;
struct drm_i915_gem_object *obj;
int ret = 0;
i915_gem_retire_requests(dev);
/* Re-check for free space after retiring requests */
if (mappable) {
if (drm_mm_search_free_in_range(&dev_priv->mm.gtt_space,
min_size, alignment, 0,
dev_priv->mm.gtt_mappable_end,
0))
return 0;
} else {
if (drm_mm_search_free(&dev_priv->mm.gtt_space,
min_size, alignment, 0))
return 0;
}
trace_i915_gem_evict(dev, min_size, alignment, mappable);
/*
* The goal is to evict objects and amalgamate space in LRU order.
* The oldest idle objects reside on the inactive list, which is in
* retirement order. The next objects to retire are those on the (per
* ring) active list that do not have an outstanding flush. Once the
* hardware reports completion (the seqno is updated after the
* batchbuffer has been finished) the clean buffer objects would
* be retired to the inactive list. Any dirty objects would be added
* to the tail of the flushing list. So after processing the clean
* active objects we need to emit a MI_FLUSH to retire the flushing
* list, hence the retirement order of the flushing list is in
* advance of the dirty objects on the active lists.
*
* The retirement sequence is thus:
* 1. Inactive objects (already retired)
* 2. Clean active objects
* 3. Flushing list
* 4. Dirty active objects.
*
* On each list, the oldest objects lie at the HEAD with the freshest
* object on the TAIL.
*/
INIT_LIST_HEAD(&unwind_list);
if (mappable)
drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, min_size,
alignment, 0,
dev_priv->mm.gtt_mappable_end);
else
drm_mm_init_scan(&dev_priv->mm.gtt_space, min_size, alignment);
/* First see if there is a large enough contiguous idle region... */
list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) {
if (mark_free(obj, &unwind_list))
goto found;
}
/* Now merge in the soon-to-be-expired objects... */
list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
/* Does the object require an outstanding flush? */
if (obj->base.write_domain || obj->pin_count)
continue;
if (mark_free(obj, &unwind_list))
goto found;
}
/* Finally add anything with a pending flush (in order of retirement) */
list_for_each_entry(obj, &dev_priv->mm.flushing_list, mm_list) {
if (obj->pin_count)
continue;
if (mark_free(obj, &unwind_list))
goto found;
}
list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
if (!obj->base.write_domain || obj->pin_count)
continue;
if (mark_free(obj, &unwind_list))
goto found;
}
/* Nothing found, clean up and bail out! */
while (!list_empty(&unwind_list)) {
obj = list_first_entry(&unwind_list,
struct drm_i915_gem_object,
exec_list);
ret = drm_mm_scan_remove_block(obj->gtt_space);
BUG_ON(ret);
list_del_init(&obj->exec_list);
drm_gem_object_unreference(&obj->base);
}
/* We expect the caller to unpin, evict all and try again, or give up.
* So calling i915_gem_evict_everything() is unnecessary.
*/
return -ENOSPC;
found:
/* drm_mm doesn't allow any other other operations while
* scanning, therefore store to be evicted objects on a
* temporary list. */
INIT_LIST_HEAD(&eviction_list);
while (!list_empty(&unwind_list)) {
obj = list_first_entry(&unwind_list,
struct drm_i915_gem_object,
exec_list);
if (drm_mm_scan_remove_block(obj->gtt_space)) {
list_move(&obj->exec_list, &eviction_list);
continue;
}
list_del_init(&obj->exec_list);
drm_gem_object_unreference(&obj->base);
}
/* Unbinding will emit any required flushes */
while (!list_empty(&eviction_list)) {
obj = list_first_entry(&eviction_list,
struct drm_i915_gem_object,
exec_list);
if (ret == 0)
ret = i915_gem_object_unbind(obj);
list_del_init(&obj->exec_list);
drm_gem_object_unreference(&obj->base);
}
return ret;
}
int
i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only)
{
drm_i915_private_t *dev_priv = dev->dev_private;
int ret;
bool lists_empty;
lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
list_empty(&dev_priv->mm.flushing_list) &&
list_empty(&dev_priv->mm.active_list));
if (lists_empty)
return -ENOSPC;
trace_i915_gem_evict_everything(dev, purgeable_only);
/* Flush everything (on to the inactive lists) and evict */
ret = i915_gpu_idle(dev);
if (ret)
return ret;
BUG_ON(!list_empty(&dev_priv->mm.flushing_list));
return i915_gem_evict_inactive(dev, purgeable_only);
}
/** Unbinds all inactive objects. */
int
i915_gem_evict_inactive(struct drm_device *dev, bool purgeable_only)
{
drm_i915_private_t *dev_priv = dev->dev_private;
struct drm_i915_gem_object *obj, *next;
list_for_each_entry_safe(obj, next,
&dev_priv->mm.inactive_list, mm_list) {
if (!purgeable_only || obj->madv != I915_MADV_WILLNEED) {
int ret = i915_gem_object_unbind(obj);
if (ret)
return ret;
}
}
return 0;
}
|
