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 /* Freeing up memory requires no VMAs are pinned */
38 if (i915_gem_obj_is_pinned(vma->obj))
41 if (WARN_ON(!list_empty(&vma->exec_list)))
44 list_add(&vma->exec_list, unwind);
45 return drm_mm_scan_add_block(&vma->node);
49 i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm,
50 int min_size, unsigned alignment, unsigned cache_level,
51 bool mappable, bool nonblocking)
53 drm_i915_private_t *dev_priv = dev->dev_private;
54 struct list_head eviction_list, unwind_list;
58 trace_i915_gem_evict(dev, min_size, alignment, mappable);
61 * The goal is to evict objects and amalgamate space in LRU order.
62 * The oldest idle objects reside on the inactive list, which is in
63 * retirement order. The next objects to retire are those on the (per
64 * ring) active list that do not have an outstanding flush. Once the
65 * hardware reports completion (the seqno is updated after the
66 * batchbuffer has been finished) the clean buffer objects would
67 * be retired to the inactive list. Any dirty objects would be added
68 * to the tail of the flushing list. So after processing the clean
69 * active objects we need to emit a MI_FLUSH to retire the flushing
70 * list, hence the retirement order of the flushing list is in
71 * advance of the dirty objects on the active lists.
73 * The retirement sequence is thus:
74 * 1. Inactive objects (already retired)
75 * 2. Clean active objects
77 * 4. Dirty active objects.
79 * On each list, the oldest objects lie at the HEAD with the freshest
83 INIT_LIST_HEAD(&unwind_list);
85 BUG_ON(!i915_is_ggtt(vm));
86 drm_mm_init_scan_with_range(&vm->mm, min_size,
87 alignment, cache_level, 0,
88 dev_priv->gtt.mappable_end);
90 drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level);
93 /* First see if there is a large enough contiguous idle region... */
94 list_for_each_entry(vma, &vm->inactive_list, mm_list) {
95 if (mark_free(vma, &unwind_list))
102 /* Now merge in the soon-to-be-expired objects... */
103 list_for_each_entry(vma, &vm->active_list, mm_list) {
104 if (mark_free(vma, &unwind_list))
109 /* Nothing found, clean up and bail out! */
110 while (!list_empty(&unwind_list)) {
111 vma = list_first_entry(&unwind_list,
114 ret = drm_mm_scan_remove_block(&vma->node);
117 list_del_init(&vma->exec_list);
120 /* Can we unpin some objects such as idle hw contents,
123 ret = nonblocking ? -ENOSPC : i915_gpu_idle(dev);
127 /* Only idle the GPU and repeat the search once */
128 i915_gem_retire_requests(dev);
133 /* drm_mm doesn't allow any other other operations while
134 * scanning, therefore store to be evicted objects on a
136 INIT_LIST_HEAD(&eviction_list);
137 while (!list_empty(&unwind_list)) {
138 vma = list_first_entry(&unwind_list,
141 if (drm_mm_scan_remove_block(&vma->node)) {
142 list_move(&vma->exec_list, &eviction_list);
143 drm_gem_object_reference(&vma->obj->base);
146 list_del_init(&vma->exec_list);
149 /* Unbinding will emit any required flushes */
150 while (!list_empty(&eviction_list)) {
151 struct drm_gem_object *obj;
152 vma = list_first_entry(&eviction_list,
156 obj = &vma->obj->base;
157 list_del_init(&vma->exec_list);
159 ret = i915_vma_unbind(vma);
161 drm_gem_object_unreference(obj);
168 * i915_gem_evict_vm - Try to free up VM space
170 * @vm: Address space to evict from
171 * @do_idle: Boolean directing whether to idle first.
173 * VM eviction is about freeing up virtual address space. If one wants fine
174 * grained eviction, they should see evict something for more details. In terms
175 * of freeing up actual system memory, this function may not accomplish the
176 * desired result. An object may be shared in multiple address space, and this
177 * function will not assert those objects be freed.
179 * Using do_idle will result in a more complete eviction because it retires, and
180 * inactivates current BOs.
182 int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle)
184 struct i915_vma *vma, *next;
187 trace_i915_gem_evict_vm(vm);
190 ret = i915_gpu_idle(vm->dev);
194 i915_gem_retire_requests(vm->dev);
197 list_for_each_entry_safe(vma, next, &vm->inactive_list, mm_list)
198 if (vma->pin_count == 0)
199 WARN_ON(i915_vma_unbind(vma));
205 i915_gem_evict_everything(struct drm_device *dev)
207 drm_i915_private_t *dev_priv = dev->dev_private;
208 struct i915_address_space *vm;
209 bool lists_empty = true;
212 list_for_each_entry(vm, &dev_priv->vm_list, global_link) {
213 lists_empty = (list_empty(&vm->inactive_list) &&
214 list_empty(&vm->active_list));
222 trace_i915_gem_evict_everything(dev);
224 /* The gpu_idle will flush everything in the write domain to the
225 * active list. Then we must move everything off the active list
226 * with retire requests.
228 ret = i915_gpu_idle(dev);
232 i915_gem_retire_requests(dev);
234 /* Having flushed everything, unbind() should never raise an error */
235 list_for_each_entry(vm, &dev_priv->vm_list, global_link)
236 WARN_ON(i915_gem_evict_vm(vm, false));