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 $
30 #include <dev/drm/drmP.h>
31 #include <dev/drm/drm.h>
36 mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind)
38 list_add(&obj->exec_list, unwind);
39 return drm_mm_scan_add_block(obj->gtt_space);
43 i915_gem_evict_something(struct drm_device *dev, int min_size,
44 unsigned alignment, bool mappable)
46 drm_i915_private_t *dev_priv = dev->dev_private;
47 struct list_head eviction_list, unwind_list;
48 struct drm_i915_gem_object *obj;
52 * The goal is to evict objects and amalgamate space in LRU order.
53 * The oldest idle objects reside on the inactive list, which is in
54 * retirement order. The next objects to retire are those on the (per
55 * ring) active list that do not have an outstanding flush. Once the
56 * hardware reports completion (the seqno is updated after the
57 * batchbuffer has been finished) the clean buffer objects would
58 * be retired to the inactive list. Any dirty objects would be added
59 * to the tail of the flushing list. So after processing the clean
60 * active objects we need to emit a MI_FLUSH to retire the flushing
61 * list, hence the retirement order of the flushing list is in
62 * advance of the dirty objects on the active lists.
64 * The retirement sequence is thus:
65 * 1. Inactive objects (already retired)
66 * 2. Clean active objects
68 * 4. Dirty active objects.
70 * On each list, the oldest objects lie at the HEAD with the freshest
74 INIT_LIST_HEAD(&unwind_list);
76 drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, min_size,
78 dev_priv->mm.gtt_mappable_end);
80 drm_mm_init_scan(&dev_priv->mm.gtt_space, min_size, alignment);
82 /* First see if there is a large enough contiguous idle region... */
83 list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) {
84 if (mark_free(obj, &unwind_list))
88 /* Now merge in the soon-to-be-expired objects... */
89 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
90 /* Does the object require an outstanding flush? */
91 if (obj->base.write_domain || obj->pin_count)
94 if (mark_free(obj, &unwind_list))
98 /* Finally add anything with a pending flush (in order of retirement) */
99 list_for_each_entry(obj, &dev_priv->mm.flushing_list, mm_list) {
103 if (mark_free(obj, &unwind_list))
106 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
107 if (!obj->base.write_domain || obj->pin_count)
110 if (mark_free(obj, &unwind_list))
114 /* Nothing found, clean up and bail out! */
115 while (!list_empty(&unwind_list)) {
116 obj = list_first_entry(&unwind_list,
117 struct drm_i915_gem_object,
120 ret = drm_mm_scan_remove_block(obj->gtt_space);
121 KASSERT(ret == 0, ("drm_mm_scan_remove_block failed %d", ret));
123 list_del_init(&obj->exec_list);
126 /* We expect the caller to unpin, evict all and try again, or give up.
127 * So calling i915_gem_evict_everything() is unnecessary.
132 /* drm_mm doesn't allow any other other operations while
133 * scanning, therefore store to be evicted objects on a
135 INIT_LIST_HEAD(&eviction_list);
136 while (!list_empty(&unwind_list)) {
137 obj = list_first_entry(&unwind_list,
138 struct drm_i915_gem_object,
140 if (drm_mm_scan_remove_block(obj->gtt_space)) {
141 list_move(&obj->exec_list, &eviction_list);
142 drm_gem_object_reference(&obj->base);
145 list_del_init(&obj->exec_list);
148 /* Unbinding will emit any required flushes */
149 while (!list_empty(&eviction_list)) {
150 obj = list_first_entry(&eviction_list,
151 struct drm_i915_gem_object,
154 ret = i915_gem_object_unbind(obj);
156 list_del_init(&obj->exec_list);
157 drm_gem_object_unreference(&obj->base);
164 i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only)
166 drm_i915_private_t *dev_priv = dev->dev_private;
170 lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
171 list_empty(&dev_priv->mm.flushing_list) &&
172 list_empty(&dev_priv->mm.active_list));
176 /* Flush everything (on to the inactive lists) and evict */
177 ret = i915_gpu_idle(dev, true);
181 KASSERT(list_empty(&dev_priv->mm.flushing_list),
182 ("flush list not empty"));
184 return i915_gem_evict_inactive(dev, purgeable_only);
187 /** Unbinds all inactive objects. */
189 i915_gem_evict_inactive(struct drm_device *dev, bool purgeable_only)
191 drm_i915_private_t *dev_priv = dev->dev_private;
192 struct drm_i915_gem_object *obj, *next;
194 list_for_each_entry_safe(obj, next,
195 &dev_priv->mm.inactive_list, mm_list) {
196 if (!purgeable_only || obj->madv != I915_MADV_WILLNEED) {
197 int ret = i915_gem_object_unbind(obj);