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1/*
2 * Copyright © 2008-2010 Intel Corporation
3 *
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:
10 *
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
13 * Software.
14 *
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
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 * Eric Anholt <eric@anholt.net>
25 * Chris Wilson <chris@chris-wilson.co.uuk>
26 *
27 */
28
29#include "drmP.h"
30#include "drm.h"
31#include "i915_drv.h"
32#include "i915_drm.h"
33#include "i915_trace.h"
34
35static bool
36mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind)
37{
38 list_add(&obj->exec_list, unwind);
39 drm_gem_object_reference(&obj->base);
40 return drm_mm_scan_add_block(obj->gtt_space);
41}
42
43int
44i915_gem_evict_something(struct drm_device *dev, int min_size,
45 unsigned alignment, bool mappable)
46{
47 drm_i915_private_t *dev_priv = dev->dev_private;
48 struct list_head eviction_list, unwind_list;
49 struct drm_i915_gem_object *obj;
50 int ret = 0;
51
52 i915_gem_retire_requests(dev);
53
54 /* Re-check for free space after retiring requests */
55 if (mappable) {
56 if (drm_mm_search_free_in_range(&dev_priv->mm.gtt_space,
57 min_size, alignment, 0,
58 dev_priv->mm.gtt_mappable_end,
59 0))
60 return 0;
61 } else {
62 if (drm_mm_search_free(&dev_priv->mm.gtt_space,
63 min_size, alignment, 0))
64 return 0;
65 }
66
67 trace_i915_gem_evict(dev, min_size, alignment, mappable);
68
69 /*
70 * The goal is to evict objects and amalgamate space in LRU order.
71 * The oldest idle objects reside on the inactive list, which is in
72 * retirement order. The next objects to retire are those on the (per
73 * ring) active list that do not have an outstanding flush. Once the
74 * hardware reports completion (the seqno is updated after the
75 * batchbuffer has been finished) the clean buffer objects would
76 * be retired to the inactive list. Any dirty objects would be added
77 * to the tail of the flushing list. So after processing the clean
78 * active objects we need to emit a MI_FLUSH to retire the flushing
79 * list, hence the retirement order of the flushing list is in
80 * advance of the dirty objects on the active lists.
81 *
82 * The retirement sequence is thus:
83 * 1. Inactive objects (already retired)
84 * 2. Clean active objects
85 * 3. Flushing list
86 * 4. Dirty active objects.
87 *
88 * On each list, the oldest objects lie at the HEAD with the freshest
89 * object on the TAIL.
90 */
91
92 INIT_LIST_HEAD(&unwind_list);
93 if (mappable)
94 drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, min_size,
95 alignment, 0,
96 dev_priv->mm.gtt_mappable_end);
97 else
98 drm_mm_init_scan(&dev_priv->mm.gtt_space, min_size, alignment);
99
100 /* First see if there is a large enough contiguous idle region... */
101 list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) {
102 if (mark_free(obj, &unwind_list))
103 goto found;
104 }
105
106 /* Now merge in the soon-to-be-expired objects... */
107 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
108 /* Does the object require an outstanding flush? */
109 if (obj->base.write_domain || obj->pin_count)
110 continue;
111
112 if (mark_free(obj, &unwind_list))
113 goto found;
114 }
115
116 /* Finally add anything with a pending flush (in order of retirement) */
117 list_for_each_entry(obj, &dev_priv->mm.flushing_list, mm_list) {
118 if (obj->pin_count)
119 continue;
120
121 if (mark_free(obj, &unwind_list))
122 goto found;
123 }
124 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
125 if (! obj->base.write_domain || obj->pin_count)
126 continue;
127
128 if (mark_free(obj, &unwind_list))
129 goto found;
130 }
131
132 /* Nothing found, clean up and bail out! */
133 while (!list_empty(&unwind_list)) {
134 obj = list_first_entry(&unwind_list,
135 struct drm_i915_gem_object,
136 exec_list);
137
138 ret = drm_mm_scan_remove_block(obj->gtt_space);
139 BUG_ON(ret);
140
141 list_del_init(&obj->exec_list);
142 drm_gem_object_unreference(&obj->base);
143 }
144
145 /* We expect the caller to unpin, evict all and try again, or give up.
146 * So calling i915_gem_evict_everything() is unnecessary.
147 */
148 return -ENOSPC;
149
150found:
151 /* drm_mm doesn't allow any other other operations while
152 * scanning, therefore store to be evicted objects on a
153 * temporary list. */
154 INIT_LIST_HEAD(&eviction_list);
155 while (!list_empty(&unwind_list)) {
156 obj = list_first_entry(&unwind_list,
157 struct drm_i915_gem_object,
158 exec_list);
159 if (drm_mm_scan_remove_block(obj->gtt_space)) {
160 list_move(&obj->exec_list, &eviction_list);
161 continue;
162 }
163 list_del_init(&obj->exec_list);
164 drm_gem_object_unreference(&obj->base);
165 }
166
167 /* Unbinding will emit any required flushes */
168 while (!list_empty(&eviction_list)) {
169 obj = list_first_entry(&eviction_list,
170 struct drm_i915_gem_object,
171 exec_list);
172 if (ret == 0)
173 ret = i915_gem_object_unbind(obj);
174
175 list_del_init(&obj->exec_list);
176 drm_gem_object_unreference(&obj->base);
177 }
178
179 return ret;
180}
181
182int
183i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only)
184{
185 drm_i915_private_t *dev_priv = dev->dev_private;
186 int ret;
187 bool lists_empty;
188
189 lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
190 list_empty(&dev_priv->mm.flushing_list) &&
191 list_empty(&dev_priv->mm.active_list));
192 if (lists_empty)
193 return -ENOSPC;
194
195 trace_i915_gem_evict_everything(dev, purgeable_only);
196
197 /* Flush everything (on to the inactive lists) and evict */
198 ret = i915_gpu_idle(dev);
199 if (ret)
200 return ret;
201
202 BUG_ON(!list_empty(&dev_priv->mm.flushing_list));
203
204 return i915_gem_evict_inactive(dev, purgeable_only);
205}
206
207/** Unbinds all inactive objects. */
208int
209i915_gem_evict_inactive(struct drm_device *dev, bool purgeable_only)
210{
211 drm_i915_private_t *dev_priv = dev->dev_private;
212 struct drm_i915_gem_object *obj, *next;
213
214 list_for_each_entry_safe(obj, next,
215 &dev_priv->mm.inactive_list, mm_list) {
216 if (!purgeable_only || obj->madv != I915_MADV_WILLNEED) {
217 int ret = i915_gem_object_unbind(obj);
218 if (ret)
219 return ret;
220 }
221 }
222
223 return 0;
224}
1/*
2 * Copyright © 2008-2010 Intel Corporation
3 *
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:
10 *
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
13 * Software.
14 *
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
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 * Eric Anholt <eric@anholt.net>
25 * Chris Wilson <chris@chris-wilson.co.uuk>
26 *
27 */
28
29#include <drm/drmP.h>
30#include <drm/i915_drm.h>
31
32#include "i915_drv.h"
33#include "intel_drv.h"
34#include "i915_trace.h"
35
36static bool ggtt_is_idle(struct drm_i915_private *dev_priv)
37{
38 struct i915_ggtt *ggtt = &dev_priv->ggtt;
39 struct intel_engine_cs *engine;
40 enum intel_engine_id id;
41
42 for_each_engine(engine, dev_priv, id) {
43 struct intel_timeline *tl;
44
45 tl = &ggtt->base.timeline.engine[engine->id];
46 if (i915_gem_active_isset(&tl->last_request))
47 return false;
48 }
49
50 return true;
51}
52
53static bool
54mark_free(struct i915_vma *vma, unsigned int flags, struct list_head *unwind)
55{
56 if (i915_vma_is_pinned(vma))
57 return false;
58
59 if (WARN_ON(!list_empty(&vma->exec_list)))
60 return false;
61
62 if (flags & PIN_NONFAULT && !list_empty(&vma->obj->userfault_link))
63 return false;
64
65 list_add(&vma->exec_list, unwind);
66 return drm_mm_scan_add_block(&vma->node);
67}
68
69/**
70 * i915_gem_evict_something - Evict vmas to make room for binding a new one
71 * @vm: address space to evict from
72 * @min_size: size of the desired free space
73 * @alignment: alignment constraint of the desired free space
74 * @cache_level: cache_level for the desired space
75 * @start: start (inclusive) of the range from which to evict objects
76 * @end: end (exclusive) of the range from which to evict objects
77 * @flags: additional flags to control the eviction algorithm
78 *
79 * This function will try to evict vmas until a free space satisfying the
80 * requirements is found. Callers must check first whether any such hole exists
81 * already before calling this function.
82 *
83 * This function is used by the object/vma binding code.
84 *
85 * Since this function is only used to free up virtual address space it only
86 * ignores pinned vmas, and not object where the backing storage itself is
87 * pinned. Hence obj->pages_pin_count does not protect against eviction.
88 *
89 * To clarify: This is for freeing up virtual address space, not for freeing
90 * memory in e.g. the shrinker.
91 */
92int
93i915_gem_evict_something(struct i915_address_space *vm,
94 u64 min_size, u64 alignment,
95 unsigned cache_level,
96 u64 start, u64 end,
97 unsigned flags)
98{
99 struct drm_i915_private *dev_priv = to_i915(vm->dev);
100 struct list_head eviction_list;
101 struct list_head *phases[] = {
102 &vm->inactive_list,
103 &vm->active_list,
104 NULL,
105 }, **phase;
106 struct i915_vma *vma, *next;
107 int ret;
108
109 lockdep_assert_held(&vm->dev->struct_mutex);
110 trace_i915_gem_evict(vm, min_size, alignment, flags);
111
112 /*
113 * The goal is to evict objects and amalgamate space in LRU order.
114 * The oldest idle objects reside on the inactive list, which is in
115 * retirement order. The next objects to retire are those in flight,
116 * on the active list, again in retirement order.
117 *
118 * The retirement sequence is thus:
119 * 1. Inactive objects (already retired)
120 * 2. Active objects (will stall on unbinding)
121 *
122 * On each list, the oldest objects lie at the HEAD with the freshest
123 * object on the TAIL.
124 */
125 if (start != 0 || end != vm->total) {
126 drm_mm_init_scan_with_range(&vm->mm, min_size,
127 alignment, cache_level,
128 start, end);
129 } else
130 drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level);
131
132 if (flags & PIN_NONBLOCK)
133 phases[1] = NULL;
134
135search_again:
136 INIT_LIST_HEAD(&eviction_list);
137 phase = phases;
138 do {
139 list_for_each_entry(vma, *phase, vm_link)
140 if (mark_free(vma, flags, &eviction_list))
141 goto found;
142 } while (*++phase);
143
144 /* Nothing found, clean up and bail out! */
145 list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
146 ret = drm_mm_scan_remove_block(&vma->node);
147 BUG_ON(ret);
148
149 INIT_LIST_HEAD(&vma->exec_list);
150 }
151
152 /* Can we unpin some objects such as idle hw contents,
153 * or pending flips? But since only the GGTT has global entries
154 * such as scanouts, rinbuffers and contexts, we can skip the
155 * purge when inspecting per-process local address spaces.
156 */
157 if (!i915_is_ggtt(vm) || flags & PIN_NONBLOCK)
158 return -ENOSPC;
159
160 if (ggtt_is_idle(dev_priv)) {
161 /* If we still have pending pageflip completions, drop
162 * back to userspace to give our workqueues time to
163 * acquire our locks and unpin the old scanouts.
164 */
165 return intel_has_pending_fb_unpin(vm->dev) ? -EAGAIN : -ENOSPC;
166 }
167
168 /* Not everything in the GGTT is tracked via vma (otherwise we
169 * could evict as required with minimal stalling) so we are forced
170 * to idle the GPU and explicitly retire outstanding requests in
171 * the hopes that we can then remove contexts and the like only
172 * bound by their active reference.
173 */
174 ret = i915_gem_switch_to_kernel_context(dev_priv);
175 if (ret)
176 return ret;
177
178 ret = i915_gem_wait_for_idle(dev_priv,
179 I915_WAIT_INTERRUPTIBLE |
180 I915_WAIT_LOCKED);
181 if (ret)
182 return ret;
183
184 i915_gem_retire_requests(dev_priv);
185 goto search_again;
186
187found:
188 /* drm_mm doesn't allow any other other operations while
189 * scanning, therefore store to-be-evicted objects on a
190 * temporary list and take a reference for all before
191 * calling unbind (which may remove the active reference
192 * of any of our objects, thus corrupting the list).
193 */
194 list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
195 if (drm_mm_scan_remove_block(&vma->node))
196 __i915_vma_pin(vma);
197 else
198 list_del_init(&vma->exec_list);
199 }
200
201 /* Unbinding will emit any required flushes */
202 ret = 0;
203 while (!list_empty(&eviction_list)) {
204 vma = list_first_entry(&eviction_list,
205 struct i915_vma,
206 exec_list);
207
208 list_del_init(&vma->exec_list);
209 __i915_vma_unpin(vma);
210 if (ret == 0)
211 ret = i915_vma_unbind(vma);
212 }
213 return ret;
214}
215
216int
217i915_gem_evict_for_vma(struct i915_vma *target)
218{
219 struct drm_mm_node *node, *next;
220
221 lockdep_assert_held(&target->vm->dev->struct_mutex);
222
223 list_for_each_entry_safe(node, next,
224 &target->vm->mm.head_node.node_list,
225 node_list) {
226 struct i915_vma *vma;
227 int ret;
228
229 if (node->start + node->size <= target->node.start)
230 continue;
231 if (node->start >= target->node.start + target->node.size)
232 break;
233
234 vma = container_of(node, typeof(*vma), node);
235
236 if (i915_vma_is_pinned(vma)) {
237 if (!vma->exec_entry || i915_vma_pin_count(vma) > 1)
238 /* Object is pinned for some other use */
239 return -EBUSY;
240
241 /* We need to evict a buffer in the same batch */
242 if (vma->exec_entry->flags & EXEC_OBJECT_PINNED)
243 /* Overlapping fixed objects in the same batch */
244 return -EINVAL;
245
246 return -ENOSPC;
247 }
248
249 ret = i915_vma_unbind(vma);
250 if (ret)
251 return ret;
252 }
253
254 return 0;
255}
256
257/**
258 * i915_gem_evict_vm - Evict all idle vmas from a vm
259 * @vm: Address space to cleanse
260 * @do_idle: Boolean directing whether to idle first.
261 *
262 * This function evicts all idles vmas from a vm. If all unpinned vmas should be
263 * evicted the @do_idle needs to be set to true.
264 *
265 * This is used by the execbuf code as a last-ditch effort to defragment the
266 * address space.
267 *
268 * To clarify: This is for freeing up virtual address space, not for freeing
269 * memory in e.g. the shrinker.
270 */
271int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle)
272{
273 struct i915_vma *vma, *next;
274 int ret;
275
276 lockdep_assert_held(&vm->dev->struct_mutex);
277 trace_i915_gem_evict_vm(vm);
278
279 if (do_idle) {
280 struct drm_i915_private *dev_priv = to_i915(vm->dev);
281
282 if (i915_is_ggtt(vm)) {
283 ret = i915_gem_switch_to_kernel_context(dev_priv);
284 if (ret)
285 return ret;
286 }
287
288 ret = i915_gem_wait_for_idle(dev_priv,
289 I915_WAIT_INTERRUPTIBLE |
290 I915_WAIT_LOCKED);
291 if (ret)
292 return ret;
293
294 i915_gem_retire_requests(dev_priv);
295 WARN_ON(!list_empty(&vm->active_list));
296 }
297
298 list_for_each_entry_safe(vma, next, &vm->inactive_list, vm_link)
299 if (!i915_vma_is_pinned(vma))
300 WARN_ON(i915_vma_unbind(vma));
301
302 return 0;
303}