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>
35 mark_free(struct drm_i915_gem_object
*obj
, struct list_head
*unwind
)
37 list_add(&obj
->evict_list
, unwind
);
38 drm_gem_object_reference(&obj
->base
);
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
;
51 i915_gem_retire_requests(dev
);
53 /* Re-check for free space after retiring requests */
55 if (drm_mm_search_free_in_range(&dev_priv
->mm
.gtt_space
,
56 min_size
, alignment
, 0,
57 dev_priv
->mm
.gtt_mappable_end
,
61 if (drm_mm_search_free(&dev_priv
->mm
.gtt_space
,
62 min_size
, alignment
, 0))
67 * The goal is to evict objects and amalgamate space in LRU order.
68 * The oldest idle objects reside on the inactive list, which is in
69 * retirement order. The next objects to retire are those on the (per
70 * ring) active list that do not have an outstanding flush. Once the
71 * hardware reports completion (the seqno is updated after the
72 * batchbuffer has been finished) the clean buffer objects would
73 * be retired to the inactive list. Any dirty objects would be added
74 * to the tail of the flushing list. So after processing the clean
75 * active objects we need to emit a MI_FLUSH to retire the flushing
76 * list, hence the retirement order of the flushing list is in
77 * advance of the dirty objects on the active lists.
79 * The retirement sequence is thus:
80 * 1. Inactive objects (already retired)
81 * 2. Clean active objects
83 * 4. Dirty active objects.
85 * On each list, the oldest objects lie at the HEAD with the freshest
89 INIT_LIST_HEAD(&unwind_list
);
91 drm_mm_init_scan_with_range(&dev_priv
->mm
.gtt_space
, min_size
,
93 dev_priv
->mm
.gtt_mappable_end
);
95 drm_mm_init_scan(&dev_priv
->mm
.gtt_space
, min_size
, alignment
);
97 /* First see if there is a large enough contiguous idle region... */
98 list_for_each_entry(obj
, &dev_priv
->mm
.inactive_list
, mm_list
) {
99 if (mark_free(obj
, &unwind_list
))
103 /* Now merge in the soon-to-be-expired objects... */
104 list_for_each_entry(obj
, &dev_priv
->mm
.active_list
, mm_list
) {
105 /* Does the object require an outstanding flush? */
106 if (obj
->base
.write_domain
|| obj
->pin_count
)
109 if (mark_free(obj
, &unwind_list
))
113 /* Finally add anything with a pending flush (in order of retirement) */
114 list_for_each_entry(obj
, &dev_priv
->mm
.flushing_list
, mm_list
) {
118 if (mark_free(obj
, &unwind_list
))
121 list_for_each_entry(obj
, &dev_priv
->mm
.active_list
, mm_list
) {
122 if (! obj
->base
.write_domain
|| obj
->pin_count
)
125 if (mark_free(obj
, &unwind_list
))
129 /* Nothing found, clean up and bail out! */
130 list_for_each_entry(obj
, &unwind_list
, evict_list
) {
131 ret
= drm_mm_scan_remove_block(obj
->gtt_space
);
133 drm_gem_object_unreference(&obj
->base
);
136 /* We expect the caller to unpin, evict all and try again, or give up.
137 * So calling i915_gem_evict_everything() is unnecessary.
142 /* drm_mm doesn't allow any other other operations while
143 * scanning, therefore store to be evicted objects on a
145 INIT_LIST_HEAD(&eviction_list
);
146 while (!list_empty(&unwind_list
)) {
147 obj
= list_first_entry(&unwind_list
,
148 struct drm_i915_gem_object
,
150 if (drm_mm_scan_remove_block(obj
->gtt_space
)) {
151 list_move(&obj
->evict_list
, &eviction_list
);
154 list_del(&obj
->evict_list
);
155 drm_gem_object_unreference(&obj
->base
);
158 /* Unbinding will emit any required flushes */
159 while (!list_empty(&eviction_list
)) {
160 obj
= list_first_entry(&eviction_list
,
161 struct drm_i915_gem_object
,
164 ret
= i915_gem_object_unbind(obj
);
165 list_del(&obj
->evict_list
);
166 drm_gem_object_unreference(&obj
->base
);
173 i915_gem_evict_everything(struct drm_device
*dev
, bool purgeable_only
)
175 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
179 lists_empty
= (list_empty(&dev_priv
->mm
.inactive_list
) &&
180 list_empty(&dev_priv
->mm
.flushing_list
) &&
181 list_empty(&dev_priv
->mm
.active_list
));
185 /* Flush everything (on to the inactive lists) and evict */
186 ret
= i915_gpu_idle(dev
);
190 BUG_ON(!list_empty(&dev_priv
->mm
.flushing_list
));
192 return i915_gem_evict_inactive(dev
, purgeable_only
);
195 /** Unbinds all inactive objects. */
197 i915_gem_evict_inactive(struct drm_device
*dev
, bool purgeable_only
)
199 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
200 struct drm_i915_gem_object
*obj
, *next
;
202 list_for_each_entry_safe(obj
, next
,
203 &dev_priv
->mm
.inactive_list
, mm_list
) {
204 if (!purgeable_only
|| obj
->madv
!= I915_MADV_WILLNEED
) {
205 int ret
= i915_gem_object_unbind(obj
);
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