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>
30 #include <drm/i915_drm.h>
33 #include "intel_drv.h"
34 #include "i915_trace.h"
37 mark_free(struct i915_vma *vma, struct list_head *unwind)
42 if (WARN_ON(!list_empty(&vma->exec_list)))
45 list_add(&vma->exec_list, unwind);
46 return drm_mm_scan_add_block(&vma->node);
50 * i915_gem_evict_something - Evict vmas to make room for binding a new one
52 * @vm: address space to evict from
53 * @min_size: size of the desired free space
54 * @alignment: alignment constraint of the desired free space
55 * @cache_level: cache_level for the desired space
56 * @start: start (inclusive) of the range from which to evict objects
57 * @end: end (exclusive) of the range from which to evict objects
58 * @flags: additional flags to control the eviction algorithm
60 * This function will try to evict vmas until a free space satisfying the
61 * requirements is found. Callers must check first whether any such hole exists
62 * already before calling this function.
64 * This function is used by the object/vma binding code.
66 * To clarify: This is for freeing up virtual address space, not for freeing
67 * memory in e.g. the shrinker.
70 i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm,
71 int min_size, unsigned alignment, unsigned cache_level,
72 unsigned long start, unsigned long end,
75 struct list_head eviction_list, unwind_list;
80 trace_i915_gem_evict(dev, min_size, alignment, flags);
83 * The goal is to evict objects and amalgamate space in LRU order.
84 * The oldest idle objects reside on the inactive list, which is in
85 * retirement order. The next objects to retire are those on the (per
86 * ring) active list that do not have an outstanding flush. Once the
87 * hardware reports completion (the seqno is updated after the
88 * batchbuffer has been finished) the clean buffer objects would
89 * be retired to the inactive list. Any dirty objects would be added
90 * to the tail of the flushing list. So after processing the clean
91 * active objects we need to emit a MI_FLUSH to retire the flushing
92 * list, hence the retirement order of the flushing list is in
93 * advance of the dirty objects on the active lists.
95 * The retirement sequence is thus:
96 * 1. Inactive objects (already retired)
97 * 2. Clean active objects
99 * 4. Dirty active objects.
101 * On each list, the oldest objects lie at the HEAD with the freshest
102 * object on the TAIL.
105 INIT_LIST_HEAD(&unwind_list);
106 if (start != 0 || end != vm->total) {
107 drm_mm_init_scan_with_range(&vm->mm, min_size,
108 alignment, cache_level,
111 drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level);
114 /* First see if there is a large enough contiguous idle region... */
115 list_for_each_entry(vma, &vm->inactive_list, mm_list) {
116 if (mark_free(vma, &unwind_list))
120 if (flags & PIN_NONBLOCK)
123 /* Now merge in the soon-to-be-expired objects... */
124 list_for_each_entry(vma, &vm->active_list, mm_list) {
125 if (mark_free(vma, &unwind_list))
130 /* Nothing found, clean up and bail out! */
131 while (!list_empty(&unwind_list)) {
132 vma = list_first_entry(&unwind_list,
135 ret = drm_mm_scan_remove_block(&vma->node);
138 list_del_init(&vma->exec_list);
141 /* Can we unpin some objects such as idle hw contents,
144 if (flags & PIN_NONBLOCK)
147 /* Only idle the GPU and repeat the search once */
149 ret = i915_gpu_idle(dev);
153 i915_gem_retire_requests(dev);
157 /* If we still have pending pageflip completions, drop
158 * back to userspace to give our workqueues time to
159 * acquire our locks and unpin the old scanouts.
161 return intel_has_pending_fb_unpin(dev) ? -EAGAIN : -ENOSPC;
164 /* drm_mm doesn't allow any other other operations while
165 * scanning, therefore store to be evicted objects on a
167 INIT_LIST_HEAD(&eviction_list);
168 while (!list_empty(&unwind_list)) {
169 vma = list_first_entry(&unwind_list,
172 if (drm_mm_scan_remove_block(&vma->node)) {
173 list_move(&vma->exec_list, &eviction_list);
174 drm_gem_object_reference(&vma->obj->base);
177 list_del_init(&vma->exec_list);
180 /* Unbinding will emit any required flushes */
181 while (!list_empty(&eviction_list)) {
182 struct drm_gem_object *obj;
183 vma = list_first_entry(&eviction_list,
187 obj = &vma->obj->base;
188 list_del_init(&vma->exec_list);
190 ret = i915_vma_unbind(vma);
192 drm_gem_object_unreference(obj);
199 * i915_gem_evict_vm - Evict all idle vmas from a vm
200 * @vm: Address space to cleanse
201 * @do_idle: Boolean directing whether to idle first.
203 * This function evicts all idles vmas from a vm. If all unpinned vmas should be
204 * evicted the @do_idle needs to be set to true.
206 * This is used by the execbuf code as a last-ditch effort to defragment the
209 * To clarify: This is for freeing up virtual address space, not for freeing
210 * memory in e.g. the shrinker.
212 int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle)
214 struct i915_vma *vma, *next;
217 WARN_ON(!mutex_is_locked(&vm->dev->struct_mutex));
218 trace_i915_gem_evict_vm(vm);
221 ret = i915_gpu_idle(vm->dev);
225 i915_gem_retire_requests(vm->dev);
227 WARN_ON(!list_empty(&vm->active_list));
230 list_for_each_entry_safe(vma, next, &vm->inactive_list, mm_list)
231 if (vma->pin_count == 0)
232 WARN_ON(i915_vma_unbind(vma));
238 * i915_gem_evict_everything - Try to evict all objects
239 * @dev: Device to evict objects for
241 * This functions tries to evict all gem objects from all address spaces. Used
242 * by the shrinker as a last-ditch effort and for suspend, before releasing the
243 * backing storage of all unbound objects.
246 i915_gem_evict_everything(struct drm_device *dev)
248 struct drm_i915_private *dev_priv = dev->dev_private;
249 struct i915_address_space *vm, *v;
250 bool lists_empty = true;
253 list_for_each_entry(vm, &dev_priv->vm_list, global_link) {
254 lists_empty = (list_empty(&vm->inactive_list) &&
255 list_empty(&vm->active_list));
263 trace_i915_gem_evict_everything(dev);
265 /* The gpu_idle will flush everything in the write domain to the
266 * active list. Then we must move everything off the active list
267 * with retire requests.
269 ret = i915_gpu_idle(dev);
273 i915_gem_retire_requests(dev);
275 /* Having flushed everything, unbind() should never raise an error */
276 list_for_each_entry_safe(vm, v, &dev_priv->vm_list, global_link)
277 WARN_ON(i915_gem_evict_vm(vm, false));