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("$FreeBSD$");
31
32 #include <dev/drm2/drmP.h>
33 #include <dev/drm2/i915/i915_drv.h>
34 #include <dev/drm2/i915/i915_drm.h>
35
36 static bool
mark_free(struct drm_i915_gem_object * obj,struct list_head * unwind)37 mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind)
38 {
39 if (obj->pin_count)
40 return false;
41
42 list_add(&obj->exec_list, unwind);
43 return drm_mm_scan_add_block(obj->gtt_space);
44 }
45
46 int
i915_gem_evict_something(struct drm_device * dev,int min_size,unsigned alignment,unsigned cache_level,bool mappable,bool nonblocking)47 i915_gem_evict_something(struct drm_device *dev, int min_size,
48 unsigned alignment, unsigned cache_level,
49 bool mappable, bool nonblocking)
50 {
51 drm_i915_private_t *dev_priv = dev->dev_private;
52 struct list_head eviction_list, unwind_list;
53 struct drm_i915_gem_object *obj;
54 int ret = 0;
55
56 CTR4(KTR_DRM, "evict_something %p %d %u %d", dev, min_size,
57 alignment, mappable);
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->mm.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, &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, &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);
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);
148
149 list_del_init(&obj->exec_list);
150 drm_gem_object_unreference(&obj->base);
151 }
152
153 return ret;
154 }
155
156 int
i915_gem_evict_everything(struct drm_device * dev)157 i915_gem_evict_everything(struct drm_device *dev)
158 {
159 drm_i915_private_t *dev_priv = dev->dev_private;
160 struct drm_i915_gem_object *obj, *next;
161 bool lists_empty;
162 int ret;
163
164 lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
165 list_empty(&dev_priv->mm.active_list));
166 if (lists_empty)
167 return -ENOSPC;
168
169 CTR1(KTR_DRM, "evict_everything %p", dev);
170
171 /* The gpu_idle will flush everything in the write domain to the
172 * active list. Then we must move everything off the active list
173 * with retire requests.
174 */
175 ret = i915_gpu_idle(dev);
176 if (ret)
177 return ret;
178
179 i915_gem_retire_requests(dev);
180
181 /* Having flushed everything, unbind() should never raise an error */
182 list_for_each_entry_safe(obj, next,
183 &dev_priv->mm.inactive_list, mm_list)
184 if (obj->pin_count == 0)
185 WARN_ON(i915_gem_object_unbind(obj));
186
187 return 0;
188 }
189