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 i915_vma *vma, struct list_head *unwind)
37 if (vma->obj->pin_count)
40 if (WARN_ON(!list_empty(&vma->exec_list)))
43 list_add(&vma->exec_list, unwind);
44 return drm_mm_scan_add_block(&vma->node);
48 i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm,
49 int min_size, unsigned alignment, unsigned cache_level,
50 bool mappable, bool nonblocking)
52 drm_i915_private_t *dev_priv = dev->dev_private;
53 struct list_head eviction_list, unwind_list;
57 trace_i915_gem_evict(dev, min_size, alignment, mappable);
60 * The goal is to evict objects and amalgamate space in LRU order.
61 * The oldest idle objects reside on the inactive list, which is in
62 * retirement order. The next objects to retire are those on the (per
63 * ring) active list that do not have an outstanding flush. Once the
64 * hardware reports completion (the seqno is updated after the
65 * batchbuffer has been finished) the clean buffer objects would
66 * be retired to the inactive list. Any dirty objects would be added
67 * to the tail of the flushing list. So after processing the clean
68 * active objects we need to emit a MI_FLUSH to retire the flushing
69 * list, hence the retirement order of the flushing list is in
70 * advance of the dirty objects on the active lists.
72 * The retirement sequence is thus:
73 * 1. Inactive objects (already retired)
74 * 2. Clean active objects
76 * 4. Dirty active objects.
78 * On each list, the oldest objects lie at the HEAD with the freshest
82 INIT_LIST_HEAD(&unwind_list);
84 BUG_ON(!i915_is_ggtt(vm));
85 drm_mm_init_scan_with_range(&vm->mm, min_size,
86 alignment, cache_level, 0,
87 dev_priv->gtt.mappable_end);
89 drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level);
92 /* First see if there is a large enough contiguous idle region... */
93 list_for_each_entry(vma, &vm->inactive_list, mm_list) {
94 if (mark_free(vma, &unwind_list))
101 /* Now merge in the soon-to-be-expired objects... */
102 list_for_each_entry(vma, &vm->active_list, mm_list) {
103 if (mark_free(vma, &unwind_list))
108 /* Nothing found, clean up and bail out! */
109 while (!list_empty(&unwind_list)) {
110 vma = list_first_entry(&unwind_list,
113 ret = drm_mm_scan_remove_block(&vma->node);
116 list_del_init(&vma->exec_list);
119 /* Can we unpin some objects such as idle hw contents,
122 ret = nonblocking ? -ENOSPC : i915_gpu_idle(dev);
126 /* Only idle the GPU and repeat the search once */
127 i915_gem_retire_requests(dev);
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 vma = list_first_entry(&unwind_list,
140 if (drm_mm_scan_remove_block(&vma->node)) {
141 list_move(&vma->exec_list, &eviction_list);
142 drm_gem_object_reference(&vma->obj->base);
145 list_del_init(&vma->exec_list);
148 /* Unbinding will emit any required flushes */
149 while (!list_empty(&eviction_list)) {
150 struct drm_gem_object *obj;
151 vma = list_first_entry(&eviction_list,
155 obj = &vma->obj->base;
156 list_del_init(&vma->exec_list);
158 ret = i915_vma_unbind(vma);
160 drm_gem_object_unreference(obj);
167 * i915_gem_evict_vm - Try to free up VM space
169 * @vm: Address space to evict from
170 * @do_idle: Boolean directing whether to idle first.
172 * VM eviction is about freeing up virtual address space. If one wants fine
173 * grained eviction, they should see evict something for more details. In terms
174 * of freeing up actual system memory, this function may not accomplish the
175 * desired result. An object may be shared in multiple address space, and this
176 * function will not assert those objects be freed.
178 * Using do_idle will result in a more complete eviction because it retires, and
179 * inactivates current BOs.
181 int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle)
183 struct i915_vma *vma, *next;
186 trace_i915_gem_evict_vm(vm);
189 ret = i915_gpu_idle(vm->dev);
193 i915_gem_retire_requests(vm->dev);
196 list_for_each_entry_safe(vma, next, &vm->inactive_list, mm_list)
197 if (vma->obj->pin_count == 0)
198 WARN_ON(i915_vma_unbind(vma));
204 i915_gem_evict_everything(struct drm_device *dev)
206 drm_i915_private_t *dev_priv = dev->dev_private;
207 struct i915_address_space *vm;
208 bool lists_empty = true;
211 list_for_each_entry(vm, &dev_priv->vm_list, global_link) {
212 lists_empty = (list_empty(&vm->inactive_list) &&
213 list_empty(&vm->active_list));
221 trace_i915_gem_evict_everything(dev);
223 /* The gpu_idle will flush everything in the write domain to the
224 * active list. Then we must move everything off the active list
225 * with retire requests.
227 ret = i915_gpu_idle(dev);
231 i915_gem_retire_requests(dev);
233 /* Having flushed everything, unbind() should never raise an error */
234 list_for_each_entry(vm, &dev_priv->vm_list, global_link)
235 WARN_ON(i915_gem_evict_vm(vm, false));