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>
34 static struct drm_i915_gem_object *
35 i915_gem_next_active_object(struct drm_device *dev,
36 struct list_head **render_iter,
37 struct list_head **bsd_iter)
39 drm_i915_private_t *dev_priv = dev->dev_private;
40 struct drm_i915_gem_object *render_obj = NULL, *bsd_obj = NULL;
42 if (*render_iter != &dev_priv->render_ring.active_list)
43 render_obj = list_entry(*render_iter,
44 struct drm_i915_gem_object,
48 if (*bsd_iter != &dev_priv->bsd_ring.active_list)
49 bsd_obj = list_entry(*bsd_iter,
50 struct drm_i915_gem_object,
53 if (render_obj == NULL) {
54 *bsd_iter = (*bsd_iter)->next;
58 if (bsd_obj == NULL) {
59 *render_iter = (*render_iter)->next;
63 /* XXX can we handle seqno wrapping? */
64 if (render_obj->last_rendering_seqno < bsd_obj->last_rendering_seqno) {
65 *render_iter = (*render_iter)->next;
68 *bsd_iter = (*bsd_iter)->next;
72 *render_iter = (*render_iter)->next;
78 mark_free(struct drm_i915_gem_object *obj_priv,
79 struct list_head *unwind)
81 list_add(&obj_priv->evict_list, unwind);
82 drm_gem_object_reference(&obj_priv->base);
83 return drm_mm_scan_add_block(obj_priv->gtt_space);
86 #define i915_for_each_active_object(OBJ, R, B) \
87 *(R) = dev_priv->render_ring.active_list.next; \
88 *(B) = dev_priv->bsd_ring.active_list.next; \
89 while (((OBJ) = i915_gem_next_active_object(dev, (R), (B))) != NULL)
92 i915_gem_evict_something(struct drm_device *dev, int min_size, unsigned alignment)
94 drm_i915_private_t *dev_priv = dev->dev_private;
95 struct list_head eviction_list, unwind_list;
96 struct drm_i915_gem_object *obj_priv;
97 struct list_head *render_iter, *bsd_iter;
100 i915_gem_retire_requests(dev);
102 /* Re-check for free space after retiring requests */
103 if (drm_mm_search_free(&dev_priv->mm.gtt_space,
104 min_size, alignment, 0))
108 * The goal is to evict objects and amalgamate space in LRU order.
109 * The oldest idle objects reside on the inactive list, which is in
110 * retirement order. The next objects to retire are those on the (per
111 * ring) active list that do not have an outstanding flush. Once the
112 * hardware reports completion (the seqno is updated after the
113 * batchbuffer has been finished) the clean buffer objects would
114 * be retired to the inactive list. Any dirty objects would be added
115 * to the tail of the flushing list. So after processing the clean
116 * active objects we need to emit a MI_FLUSH to retire the flushing
117 * list, hence the retirement order of the flushing list is in
118 * advance of the dirty objects on the active lists.
120 * The retirement sequence is thus:
121 * 1. Inactive objects (already retired)
122 * 2. Clean active objects
124 * 4. Dirty active objects.
126 * On each list, the oldest objects lie at the HEAD with the freshest
127 * object on the TAIL.
130 INIT_LIST_HEAD(&unwind_list);
131 drm_mm_init_scan(&dev_priv->mm.gtt_space, min_size, alignment);
133 /* First see if there is a large enough contiguous idle region... */
134 list_for_each_entry(obj_priv, &dev_priv->mm.inactive_list, list) {
135 if (mark_free(obj_priv, &unwind_list))
139 /* Now merge in the soon-to-be-expired objects... */
140 i915_for_each_active_object(obj_priv, &render_iter, &bsd_iter) {
141 /* Does the object require an outstanding flush? */
142 if (obj_priv->base.write_domain || obj_priv->pin_count)
145 if (mark_free(obj_priv, &unwind_list))
149 /* Finally add anything with a pending flush (in order of retirement) */
150 list_for_each_entry(obj_priv, &dev_priv->mm.flushing_list, list) {
151 if (obj_priv->pin_count)
154 if (mark_free(obj_priv, &unwind_list))
157 i915_for_each_active_object(obj_priv, &render_iter, &bsd_iter) {
158 if (! obj_priv->base.write_domain || obj_priv->pin_count)
161 if (mark_free(obj_priv, &unwind_list))
165 /* Nothing found, clean up and bail out! */
166 list_for_each_entry(obj_priv, &unwind_list, evict_list) {
167 ret = drm_mm_scan_remove_block(obj_priv->gtt_space);
169 drm_gem_object_unreference(&obj_priv->base);
172 /* We expect the caller to unpin, evict all and try again, or give up.
173 * So calling i915_gem_evict_everything() is unnecessary.
178 /* drm_mm doesn't allow any other other operations while
179 * scanning, therefore store to be evicted objects on a
181 INIT_LIST_HEAD(&eviction_list);
182 while (!list_empty(&unwind_list)) {
183 obj_priv = list_first_entry(&unwind_list,
184 struct drm_i915_gem_object,
186 if (drm_mm_scan_remove_block(obj_priv->gtt_space)) {
187 list_move(&obj_priv->evict_list, &eviction_list);
190 list_del(&obj_priv->evict_list);
191 drm_gem_object_unreference(&obj_priv->base);
194 /* Unbinding will emit any required flushes */
195 while (!list_empty(&eviction_list)) {
196 obj_priv = list_first_entry(&eviction_list,
197 struct drm_i915_gem_object,
200 ret = i915_gem_object_unbind(&obj_priv->base);
201 list_del(&obj_priv->evict_list);
202 drm_gem_object_unreference(&obj_priv->base);
209 i915_gem_evict_everything(struct drm_device *dev)
211 drm_i915_private_t *dev_priv = dev->dev_private;
215 spin_lock(&dev_priv->mm.active_list_lock);
216 lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
217 list_empty(&dev_priv->mm.flushing_list) &&
218 list_empty(&dev_priv->render_ring.active_list) &&
220 || list_empty(&dev_priv->bsd_ring.active_list)));
221 spin_unlock(&dev_priv->mm.active_list_lock);
226 /* Flush everything (on to the inactive lists) and evict */
227 ret = i915_gpu_idle(dev);
231 BUG_ON(!list_empty(&dev_priv->mm.flushing_list));
233 ret = i915_gem_evict_inactive(dev);
237 spin_lock(&dev_priv->mm.active_list_lock);
238 lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
239 list_empty(&dev_priv->mm.flushing_list) &&
240 list_empty(&dev_priv->render_ring.active_list) &&
242 || list_empty(&dev_priv->bsd_ring.active_list)));
243 spin_unlock(&dev_priv->mm.active_list_lock);
244 BUG_ON(!lists_empty);
249 /** Unbinds all inactive objects. */
251 i915_gem_evict_inactive(struct drm_device *dev)
253 drm_i915_private_t *dev_priv = dev->dev_private;
255 while (!list_empty(&dev_priv->mm.inactive_list)) {
256 struct drm_gem_object *obj;
259 obj = &list_first_entry(&dev_priv->mm.inactive_list,
260 struct drm_i915_gem_object,
263 ret = i915_gem_object_unbind(obj);
265 DRM_ERROR("Error unbinding object: %d\n", ret);