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>
31 #include <drm/i915_drm.h>
32 #include "i915_trace.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
, unsigned cache_level
,
47 bool mappable
, bool nonblocking
)
49 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
50 struct list_head eviction_list
, unwind_list
;
51 struct drm_i915_gem_object
*obj
;
54 trace_i915_gem_evict(dev
, min_size
, alignment
, mappable
);
57 * The goal is to evict objects and amalgamate space in LRU order.
58 * The oldest idle objects reside on the inactive list, which is in
59 * retirement order. The next objects to retire are those on the (per
60 * ring) active list that do not have an outstanding flush. Once the
61 * hardware reports completion (the seqno is updated after the
62 * batchbuffer has been finished) the clean buffer objects would
63 * be retired to the inactive list. Any dirty objects would be added
64 * to the tail of the flushing list. So after processing the clean
65 * active objects we need to emit a MI_FLUSH to retire the flushing
66 * list, hence the retirement order of the flushing list is in
67 * advance of the dirty objects on the active lists.
69 * The retirement sequence is thus:
70 * 1. Inactive objects (already retired)
71 * 2. Clean active objects
73 * 4. Dirty active objects.
75 * On each list, the oldest objects lie at the HEAD with the freshest
79 INIT_LIST_HEAD(&unwind_list
);
81 drm_mm_init_scan_with_range(&dev_priv
->mm
.gtt_space
,
82 min_size
, alignment
, cache_level
,
83 0, dev_priv
->gtt
.mappable_end
);
85 drm_mm_init_scan(&dev_priv
->mm
.gtt_space
,
86 min_size
, alignment
, cache_level
);
88 /* First see if there is a large enough contiguous idle region... */
89 list_for_each_entry(obj
, &dev_priv
->mm
.inactive_list
, mm_list
) {
90 if (mark_free(obj
, &unwind_list
))
97 /* Now merge in the soon-to-be-expired objects... */
98 list_for_each_entry(obj
, &dev_priv
->mm
.active_list
, mm_list
) {
99 if (mark_free(obj
, &unwind_list
))
104 /* Nothing found, clean up and bail out! */
105 while (!list_empty(&unwind_list
)) {
106 obj
= list_first_entry(&unwind_list
,
107 struct drm_i915_gem_object
,
110 ret
= drm_mm_scan_remove_block(obj
->gtt_space
);
113 list_del_init(&obj
->exec_list
);
116 /* We expect the caller to unpin, evict all and try again, or give up.
117 * So calling i915_gem_evict_everything() is unnecessary.
122 /* drm_mm doesn't allow any other other operations while
123 * scanning, therefore store to be evicted objects on a
125 INIT_LIST_HEAD(&eviction_list
);
126 while (!list_empty(&unwind_list
)) {
127 obj
= list_first_entry(&unwind_list
,
128 struct drm_i915_gem_object
,
130 if (drm_mm_scan_remove_block(obj
->gtt_space
)) {
131 list_move(&obj
->exec_list
, &eviction_list
);
132 drm_gem_object_reference(&obj
->base
);
135 list_del_init(&obj
->exec_list
);
138 /* Unbinding will emit any required flushes */
139 while (!list_empty(&eviction_list
)) {
140 obj
= list_first_entry(&eviction_list
,
141 struct drm_i915_gem_object
,
144 ret
= i915_gem_object_unbind(obj
);
146 list_del_init(&obj
->exec_list
);
147 drm_gem_object_unreference(&obj
->base
);
154 i915_gem_evict_everything(struct drm_device
*dev
)
156 drm_i915_private_t
*dev_priv
= dev
->dev_private
;
157 struct drm_i915_gem_object
*obj
, *next
;
161 lists_empty
= (list_empty(&dev_priv
->mm
.inactive_list
) &&
162 list_empty(&dev_priv
->mm
.active_list
));
166 trace_i915_gem_evict_everything(dev
);
168 /* The gpu_idle will flush everything in the write domain to the
169 * active list. Then we must move everything off the active list
170 * with retire requests.
172 ret
= i915_gpu_idle(dev
);
176 i915_gem_retire_requests(dev
);
178 /* Having flushed everything, unbind() should never raise an error */
179 list_for_each_entry_safe(obj
, next
,
180 &dev_priv
->mm
.inactive_list
, mm_list
)
181 if (obj
->pin_count
== 0)
182 WARN_ON(i915_gem_object_unbind(obj
));
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