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 | |
36 | static bool |
37 | mark_free(struct i915_vma *vma, struct list_head *unwind) |
38 | { |
39 | if (vma->pin_count) |
40 | return false; |
41 | |
42 | if (WARN_ON(!list_empty(&vma->exec_list))) |
43 | return false; |
44 | |
45 | list_add(&vma->exec_list, unwind); |
46 | return drm_mm_scan_add_block(&vma->node); |
47 | } |
48 | |
49 | /** |
50 | * i915_gem_evict_something - Evict vmas to make room for binding a new one |
51 | * @dev: drm_device |
52 | * @vm: address space to evict from |
53 | * @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 | * @mappable: whether the free space must be mappable |
57 | * @nonblocking: whether evicting active objects is allowed or not |
58 | * |
59 | * This function will try to evict vmas until a free space satisfying the |
60 | * requirements is found. Callers must check first whether any such hole exists |
61 | * already before calling this function. |
62 | * |
63 | * This function is used by the object/vma binding code. |
64 | * |
65 | * To clarify: This is for freeing up virtual address space, not for freeing |
66 | * memory in e.g. the shrinker. |
67 | */ |
68 | int |
69 | i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm, |
70 | int min_size, unsigned alignment, unsigned cache_level, |
71 | unsigned long start, unsigned long end, |
72 | unsigned flags) |
73 | { |
74 | struct list_head eviction_list, unwind_list; |
75 | struct i915_vma *vma; |
76 | int ret = 0; |
77 | int pass = 0; |
78 | |
79 | trace_i915_gem_evict(dev, min_size, alignment, flags); |
80 | |
81 | /* |
82 | * The goal is to evict objects and amalgamate space in LRU order. |
83 | * The oldest idle objects reside on the inactive list, which is in |
84 | * retirement order. The next objects to retire are those on the (per |
85 | * ring) active list that do not have an outstanding flush. Once the |
86 | * hardware reports completion (the seqno is updated after the |
87 | * batchbuffer has been finished) the clean buffer objects would |
88 | * be retired to the inactive list. Any dirty objects would be added |
89 | * to the tail of the flushing list. So after processing the clean |
90 | * active objects we need to emit a MI_FLUSH to retire the flushing |
91 | * list, hence the retirement order of the flushing list is in |
92 | * advance of the dirty objects on the active lists. |
93 | * |
94 | * The retirement sequence is thus: |
95 | * 1. Inactive objects (already retired) |
96 | * 2. Clean active objects |
97 | * 3. Flushing list |
98 | * 4. Dirty active objects. |
99 | * |
100 | * On each list, the oldest objects lie at the HEAD with the freshest |
101 | * object on the TAIL. |
102 | */ |
103 | |
104 | INIT_LIST_HEAD(&unwind_list); |
105 | if (start != 0 || end != vm->total) { |
106 | drm_mm_init_scan_with_range(&vm->mm, min_size, |
107 | alignment, cache_level, |
108 | start, end); |
109 | } else |
110 | drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level); |
111 | |
112 | search_again: |
113 | /* First see if there is a large enough contiguous idle region... */ |
114 | list_for_each_entry(vma, &vm->inactive_list, mm_list) { |
115 | if (mark_free(vma, &unwind_list)) |
116 | goto found; |
117 | } |
118 | |
119 | if (flags & PIN_NONBLOCK) |
120 | goto none; |
121 | |
122 | /* Now merge in the soon-to-be-expired objects... */ |
123 | list_for_each_entry(vma, &vm->active_list, mm_list) { |
124 | if (mark_free(vma, &unwind_list)) |
125 | goto found; |
126 | } |
127 | |
128 | none: |
129 | /* Nothing found, clean up and bail out! */ |
130 | while (!list_empty(&unwind_list)) { |
131 | vma = list_first_entry(&unwind_list, |
132 | struct i915_vma, |
133 | exec_list); |
134 | ret = drm_mm_scan_remove_block(&vma->node); |
135 | BUG_ON(ret); |
136 | |
137 | list_del_init(&vma->exec_list); |
138 | } |
139 | |
140 | /* Can we unpin some objects such as idle hw contents, |
141 | * or pending flips? |
142 | */ |
143 | if (flags & PIN_NONBLOCK) |
144 | return -ENOSPC; |
145 | |
146 | /* Only idle the GPU and repeat the search once */ |
147 | if (pass++ == 0) { |
148 | ret = i915_gpu_idle(dev); |
149 | if (ret) |
150 | return ret; |
151 | |
152 | i915_gem_retire_requests(dev); |
153 | goto search_again; |
154 | } |
155 | |
156 | /* If we still have pending pageflip completions, drop |
157 | * back to userspace to give our workqueues time to |
158 | * acquire our locks and unpin the old scanouts. |
159 | */ |
160 | return intel_has_pending_fb_unpin(dev) ? -EAGAIN : -ENOSPC; |
161 | |
162 | found: |
163 | /* drm_mm doesn't allow any other other operations while |
164 | * scanning, therefore store to be evicted objects on a |
165 | * temporary list. */ |
166 | INIT_LIST_HEAD(&eviction_list); |
167 | while (!list_empty(&unwind_list)) { |
168 | vma = list_first_entry(&unwind_list, |
169 | struct i915_vma, |
170 | exec_list); |
171 | if (drm_mm_scan_remove_block(&vma->node)) { |
172 | list_move(&vma->exec_list, &eviction_list); |
173 | drm_gem_object_reference(&vma->obj->base); |
174 | continue; |
175 | } |
176 | list_del_init(&vma->exec_list); |
177 | } |
178 | |
179 | /* Unbinding will emit any required flushes */ |
180 | while (!list_empty(&eviction_list)) { |
181 | struct drm_gem_object *obj; |
182 | vma = list_first_entry(&eviction_list, |
183 | struct i915_vma, |
184 | exec_list); |
185 | |
186 | obj = &vma->obj->base; |
187 | list_del_init(&vma->exec_list); |
188 | if (ret == 0) |
189 | ret = i915_vma_unbind(vma); |
190 | |
191 | drm_gem_object_unreference(obj); |
192 | } |
193 | |
194 | return ret; |
195 | } |
196 | |
197 | /** |
198 | * i915_gem_evict_vm - Evict all idle vmas from a vm |
199 | * |
200 | * @vm: Address space to cleanse |
201 | * @do_idle: Boolean directing whether to idle first. |
202 | * |
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. |
205 | * |
206 | * This is used by the execbuf code as a last-ditch effort to defragment the |
207 | * address space. |
208 | * |
209 | * To clarify: This is for freeing up virtual address space, not for freeing |
210 | * memory in e.g. the shrinker. |
211 | */ |
212 | int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle) |
213 | { |
214 | struct i915_vma *vma, *next; |
215 | int ret; |
216 | |
217 | trace_i915_gem_evict_vm(vm); |
218 | |
219 | if (do_idle) { |
220 | ret = i915_gpu_idle(vm->dev); |
221 | if (ret) |
222 | return ret; |
223 | |
224 | i915_gem_retire_requests(vm->dev); |
225 | } |
226 | |
227 | list_for_each_entry_safe(vma, next, &vm->inactive_list, mm_list) |
228 | if (vma->pin_count == 0) |
229 | WARN_ON(i915_vma_unbind(vma)); |
230 | |
231 | return 0; |
232 | } |
233 | |
234 | /** |
235 | * i915_gem_evict_everything - Try to evict all objects |
236 | * @dev: Device to evict objects for |
237 | * |
238 | * This functions tries to evict all gem objects from all address spaces. Used |
239 | * by the shrinker as a last-ditch effort and for suspend, before releasing the |
240 | * backing storage of all unbound objects. |
241 | */ |
242 | int |
243 | i915_gem_evict_everything(struct drm_device *dev) |
244 | { |
245 | struct drm_i915_private *dev_priv = dev->dev_private; |
246 | struct i915_address_space *vm; |
247 | bool lists_empty = true; |
248 | int ret; |
249 | |
250 | list_for_each_entry(vm, &dev_priv->vm_list, global_link) { |
251 | lists_empty = (list_empty(&vm->inactive_list) && |
252 | list_empty(&vm->active_list)); |
253 | if (!lists_empty) |
254 | lists_empty = false; |
255 | } |
256 | |
257 | if (lists_empty) |
258 | return -ENOSPC; |
259 | |
260 | trace_i915_gem_evict_everything(dev); |
261 | |
262 | /* The gpu_idle will flush everything in the write domain to the |
263 | * active list. Then we must move everything off the active list |
264 | * with retire requests. |
265 | */ |
266 | ret = i915_gpu_idle(dev); |
267 | if (ret) |
268 | return ret; |
269 | |
270 | i915_gem_retire_requests(dev); |
271 | |
272 | /* Having flushed everything, unbind() should never raise an error */ |
273 | list_for_each_entry(vm, &dev_priv->vm_list, global_link) |
274 | WARN_ON(i915_gem_evict_vm(vm, false)); |
275 | |
276 | return 0; |
277 | } |
278 | |