2 * Copyright © 2008-2010 Intel Corporation
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:
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
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
24 * Eric Anholt <eric@anholt.net>
25 * Chris Wilson <chris@chris-wilson.co.uuk>
27 * $FreeBSD: src/sys/dev/drm2/i915/i915_gem_evict.c,v 1.1 2012/05/22 11:07:44 kib Exp $
31 #include <drm/i915_drm.h>
35 mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind)
37 list_add(&obj->exec_list, unwind);
38 return drm_mm_scan_add_block(obj->gtt_space);
42 i915_gem_evict_something(struct drm_device *dev, int min_size,
43 unsigned alignment, bool mappable)
45 drm_i915_private_t *dev_priv = dev->dev_private;
46 struct list_head eviction_list, unwind_list;
47 struct drm_i915_gem_object *obj;
51 * The goal is to evict objects and amalgamate space in LRU order.
52 * The oldest idle objects reside on the inactive list, which is in
53 * retirement order. The next objects to retire are those on the (per
54 * ring) active list that do not have an outstanding flush. Once the
55 * hardware reports completion (the seqno is updated after the
56 * batchbuffer has been finished) the clean buffer objects would
57 * be retired to the inactive list. Any dirty objects would be added
58 * to the tail of the flushing list. So after processing the clean
59 * active objects we need to emit a MI_FLUSH to retire the flushing
60 * list, hence the retirement order of the flushing list is in
61 * advance of the dirty objects on the active lists.
63 * The retirement sequence is thus:
64 * 1. Inactive objects (already retired)
65 * 2. Clean active objects
67 * 4. Dirty active objects.
69 * On each list, the oldest objects lie at the HEAD with the freshest
73 INIT_LIST_HEAD(&unwind_list);
75 drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, min_size,
77 dev_priv->mm.gtt_mappable_end);
79 drm_mm_init_scan(&dev_priv->mm.gtt_space, min_size, alignment);
81 /* First see if there is a large enough contiguous idle region... */
82 list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) {
83 if (mark_free(obj, &unwind_list))
87 /* Now merge in the soon-to-be-expired objects... */
88 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
89 /* Does the object require an outstanding flush? */
90 if (obj->base.write_domain || obj->pin_count)
93 if (mark_free(obj, &unwind_list))
97 /* Finally add anything with a pending flush (in order of retirement) */
98 list_for_each_entry(obj, &dev_priv->mm.flushing_list, mm_list) {
102 if (mark_free(obj, &unwind_list))
105 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
106 if (!obj->base.write_domain || obj->pin_count)
109 if (mark_free(obj, &unwind_list))
113 /* Nothing found, clean up and bail out! */
114 while (!list_empty(&unwind_list)) {
115 obj = list_first_entry(&unwind_list,
116 struct drm_i915_gem_object,
119 ret = drm_mm_scan_remove_block(obj->gtt_space);
120 KASSERT(ret == 0, ("drm_mm_scan_remove_block failed %d", ret));
122 list_del_init(&obj->exec_list);
125 /* We expect the caller to unpin, evict all and try again, or give up.
126 * So calling i915_gem_evict_everything() is unnecessary.
131 /* drm_mm doesn't allow any other other operations while
132 * scanning, therefore store to be evicted objects on a
134 INIT_LIST_HEAD(&eviction_list);
135 while (!list_empty(&unwind_list)) {
136 obj = list_first_entry(&unwind_list,
137 struct drm_i915_gem_object,
139 if (drm_mm_scan_remove_block(obj->gtt_space)) {
140 list_move(&obj->exec_list, &eviction_list);
141 drm_gem_object_reference(&obj->base);
144 list_del_init(&obj->exec_list);
147 /* Unbinding will emit any required flushes */
148 while (!list_empty(&eviction_list)) {
149 obj = list_first_entry(&eviction_list,
150 struct drm_i915_gem_object,
153 ret = i915_gem_object_unbind(obj);
155 list_del_init(&obj->exec_list);
156 drm_gem_object_unreference(&obj->base);
163 i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only)
165 drm_i915_private_t *dev_priv = dev->dev_private;
169 lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
170 list_empty(&dev_priv->mm.flushing_list) &&
171 list_empty(&dev_priv->mm.active_list));
175 /* Flush everything (on to the inactive lists) and evict */
176 ret = i915_gpu_idle(dev, true);
180 KASSERT(list_empty(&dev_priv->mm.flushing_list),
181 ("flush list not empty"));
183 return i915_gem_evict_inactive(dev, purgeable_only);
186 /** Unbinds all inactive objects. */
188 i915_gem_evict_inactive(struct drm_device *dev, bool purgeable_only)
190 drm_i915_private_t *dev_priv = dev->dev_private;
191 struct drm_i915_gem_object *obj, *next;
193 list_for_each_entry_safe(obj, next,
194 &dev_priv->mm.inactive_list, mm_list) {
195 if (!purgeable_only || obj->madv != I915_MADV_WILLNEED) {
196 int ret = i915_gem_object_unbind(obj);