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)
40 list_add(&obj->exec_list, unwind);
41 return drm_mm_scan_add_block(obj->gtt_space);
45 i915_gem_evict_something(struct drm_device *dev, int min_size,
46 unsigned alignment, bool mappable)
48 drm_i915_private_t *dev_priv = dev->dev_private;
49 struct list_head eviction_list, unwind_list;
50 struct drm_i915_gem_object *obj;
55 * The goal is to evict objects and amalgamate space in LRU order.
56 * The oldest idle objects reside on the inactive list, which is in
57 * retirement order. The next objects to retire are those on the (per
58 * ring) active list that do not have an outstanding flush. Once the
59 * hardware reports completion (the seqno is updated after the
60 * batchbuffer has been finished) the clean buffer objects would
61 * be retired to the inactive list. Any dirty objects would be added
62 * to the tail of the flushing list. So after processing the clean
63 * active objects we need to emit a MI_FLUSH to retire the flushing
64 * list, hence the retirement order of the flushing list is in
65 * advance of the dirty objects on the active lists.
67 * The retirement sequence is thus:
68 * 1. Inactive objects (already retired)
69 * 2. Clean active objects
71 * 4. Dirty active objects.
73 * On each list, the oldest objects lie at the HEAD with the freshest
77 INIT_LIST_HEAD(&unwind_list);
79 drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space,
80 min_size, alignment, cache_level,
81 0, dev_priv->mm.gtt_mappable_end);
83 drm_mm_init_scan(&dev_priv->mm.gtt_space,
84 min_size, alignment, cache_level);
86 /* First see if there is a large enough contiguous idle region... */
87 list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) {
88 if (mark_free(obj, &unwind_list))
92 /* Now merge in the soon-to-be-expired objects... */
93 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
94 /* Does the object require an outstanding flush? */
95 if (obj->base.write_domain || obj->pin_count)
98 if (mark_free(obj, &unwind_list))
102 /* Finally add anything with a pending flush (in order of retirement) */
103 list_for_each_entry(obj, &dev_priv->mm.flushing_list, mm_list) {
107 if (mark_free(obj, &unwind_list))
110 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
111 if (!obj->base.write_domain || obj->pin_count)
114 if (mark_free(obj, &unwind_list))
118 /* Nothing found, clean up and bail out! */
119 while (!list_empty(&unwind_list)) {
120 obj = list_first_entry(&unwind_list,
121 struct drm_i915_gem_object,
124 ret = drm_mm_scan_remove_block(obj->gtt_space);
125 KASSERT(ret == 0, ("drm_mm_scan_remove_block failed %d", ret));
127 list_del_init(&obj->exec_list);
130 /* We expect the caller to unpin, evict all and try again, or give up.
131 * So calling i915_gem_evict_everything() is unnecessary.
136 /* drm_mm doesn't allow any other other operations while
137 * scanning, therefore store to be evicted objects on a
139 INIT_LIST_HEAD(&eviction_list);
140 while (!list_empty(&unwind_list)) {
141 obj = list_first_entry(&unwind_list,
142 struct drm_i915_gem_object,
144 if (drm_mm_scan_remove_block(obj->gtt_space)) {
145 list_move(&obj->exec_list, &eviction_list);
146 drm_gem_object_reference(&obj->base);
149 list_del_init(&obj->exec_list);
152 /* Unbinding will emit any required flushes */
153 while (!list_empty(&eviction_list)) {
154 obj = list_first_entry(&eviction_list,
155 struct drm_i915_gem_object,
158 ret = i915_gem_object_unbind(obj);
160 list_del_init(&obj->exec_list);
161 drm_gem_object_unreference(&obj->base);
168 i915_gem_evict_everything(struct drm_device *dev)
170 drm_i915_private_t *dev_priv = dev->dev_private;
171 struct drm_i915_gem_object *obj, *next;
175 lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
176 list_empty(&dev_priv->mm.active_list));
180 /* The gpu_idle will flush everything in the write domain to the
181 * active list. Then we must move everything off the active list
182 * with retire requests.
184 ret = i915_gpu_idle(dev);
188 i915_gem_retire_requests(dev);
190 /* Having flushed everything, unbind() should never raise an error */
191 list_for_each_entry_safe(obj, next,
192 &dev_priv->mm.inactive_list, mm_list)
193 if (obj->pin_count == 0)
194 WARN_ON(i915_gem_object_unbind(obj));