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[FreeBSD/FreeBSD.git] / sys / dev / drm2 / i915 / i915_gem_evict.c
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
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
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
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 }