Commit | Line | Data |
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b47eb4a2 CW |
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 | ||
760285e7 | 29 | #include <drm/drmP.h> |
760285e7 | 30 | #include <drm/i915_drm.h> |
74e21ac2 CW |
31 | |
32 | #include "i915_drv.h" | |
33 | #include "intel_drv.h" | |
db53a302 | 34 | #include "i915_trace.h" |
b47eb4a2 | 35 | |
9332f3b1 CW |
36 | static bool |
37 | gpu_is_idle(struct drm_i915_private *dev_priv) | |
38 | { | |
39 | struct intel_engine_cs *engine; | |
40 | ||
41 | for_each_engine(engine, dev_priv) { | |
dcff85c8 | 42 | if (intel_engine_is_active(engine)) |
9332f3b1 CW |
43 | return false; |
44 | } | |
45 | ||
46 | return true; | |
47 | } | |
48 | ||
cd377ea9 | 49 | static bool |
82118877 | 50 | mark_free(struct i915_vma *vma, unsigned int flags, struct list_head *unwind) |
b47eb4a2 | 51 | { |
20dfbde4 | 52 | if (i915_vma_is_pinned(vma)) |
1b50247a CW |
53 | return false; |
54 | ||
b93dab6e DV |
55 | if (WARN_ON(!list_empty(&vma->exec_list))) |
56 | return false; | |
57 | ||
82118877 CW |
58 | if (flags & PIN_NONFAULT && vma->obj->fault_mappable) |
59 | return false; | |
60 | ||
82a55ad1 | 61 | list_add(&vma->exec_list, unwind); |
2f633156 | 62 | return drm_mm_scan_add_block(&vma->node); |
b47eb4a2 CW |
63 | } |
64 | ||
c2c1d491 DV |
65 | /** |
66 | * i915_gem_evict_something - Evict vmas to make room for binding a new one | |
c2c1d491 | 67 | * @vm: address space to evict from |
7838a63a | 68 | * @min_size: size of the desired free space |
c2c1d491 DV |
69 | * @alignment: alignment constraint of the desired free space |
70 | * @cache_level: cache_level for the desired space | |
7838a63a DV |
71 | * @start: start (inclusive) of the range from which to evict objects |
72 | * @end: end (exclusive) of the range from which to evict objects | |
73 | * @flags: additional flags to control the eviction algorithm | |
c2c1d491 DV |
74 | * |
75 | * This function will try to evict vmas until a free space satisfying the | |
76 | * requirements is found. Callers must check first whether any such hole exists | |
77 | * already before calling this function. | |
78 | * | |
79 | * This function is used by the object/vma binding code. | |
80 | * | |
eb0b44ad DV |
81 | * Since this function is only used to free up virtual address space it only |
82 | * ignores pinned vmas, and not object where the backing storage itself is | |
83 | * pinned. Hence obj->pages_pin_count does not protect against eviction. | |
84 | * | |
c2c1d491 DV |
85 | * To clarify: This is for freeing up virtual address space, not for freeing |
86 | * memory in e.g. the shrinker. | |
87 | */ | |
b47eb4a2 | 88 | int |
e522ac23 | 89 | i915_gem_evict_something(struct i915_address_space *vm, |
2ffffd0f CW |
90 | u64 min_size, u64 alignment, |
91 | unsigned cache_level, | |
92 | u64 start, u64 end, | |
1ec9e26d | 93 | unsigned flags) |
b47eb4a2 | 94 | { |
e522ac23 | 95 | struct drm_i915_private *dev_priv = to_i915(vm->dev); |
9332f3b1 CW |
96 | struct list_head eviction_list; |
97 | struct list_head *phases[] = { | |
98 | &vm->inactive_list, | |
99 | &vm->active_list, | |
100 | NULL, | |
101 | }, **phase; | |
102 | struct i915_vma *vma, *next; | |
103 | int ret; | |
b47eb4a2 | 104 | |
e522ac23 | 105 | trace_i915_gem_evict(vm, min_size, alignment, flags); |
db53a302 | 106 | |
cd377ea9 CW |
107 | /* |
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 | |
9332f3b1 CW |
110 | * retirement order. The next objects to retire are those in flight, |
111 | * on the active list, again in retirement order. | |
cd377ea9 CW |
112 | * |
113 | * The retirement sequence is thus: | |
114 | * 1. Inactive objects (already retired) | |
9332f3b1 | 115 | * 2. Active objects (will stall on unbinding) |
cd377ea9 CW |
116 | * |
117 | * On each list, the oldest objects lie at the HEAD with the freshest | |
118 | * object on the TAIL. | |
119 | */ | |
d23db88c | 120 | if (start != 0 || end != vm->total) { |
5cef07e1 | 121 | drm_mm_init_scan_with_range(&vm->mm, min_size, |
d23db88c CW |
122 | alignment, cache_level, |
123 | start, end); | |
f6cd1f15 | 124 | } else |
5cef07e1 | 125 | drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level); |
cd377ea9 | 126 | |
1ec9e26d | 127 | if (flags & PIN_NONBLOCK) |
9332f3b1 | 128 | phases[1] = NULL; |
b47eb4a2 | 129 | |
9332f3b1 CW |
130 | search_again: |
131 | INIT_LIST_HEAD(&eviction_list); | |
132 | phase = phases; | |
133 | do { | |
134 | list_for_each_entry(vma, *phase, vm_link) | |
82118877 | 135 | if (mark_free(vma, flags, &eviction_list)) |
9332f3b1 CW |
136 | goto found; |
137 | } while (*++phase); | |
cd377ea9 CW |
138 | |
139 | /* Nothing found, clean up and bail out! */ | |
9332f3b1 | 140 | list_for_each_entry_safe(vma, next, &eviction_list, exec_list) { |
2f633156 | 141 | ret = drm_mm_scan_remove_block(&vma->node); |
cd377ea9 | 142 | BUG_ON(ret); |
092de6f2 | 143 | |
9332f3b1 | 144 | INIT_LIST_HEAD(&vma->exec_list); |
cd377ea9 CW |
145 | } |
146 | ||
ad071acb | 147 | /* Can we unpin some objects such as idle hw contents, |
9332f3b1 CW |
148 | * or pending flips? But since only the GGTT has global entries |
149 | * such as scanouts, rinbuffers and contexts, we can skip the | |
150 | * purge when inspecting per-process local address spaces. | |
cd377ea9 | 151 | */ |
9332f3b1 | 152 | if (!i915_is_ggtt(vm) || flags & PIN_NONBLOCK) |
74e21ac2 | 153 | return -ENOSPC; |
ad071acb | 154 | |
9332f3b1 CW |
155 | if (gpu_is_idle(dev_priv)) { |
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 | */ | |
e522ac23 | 160 | return intel_has_pending_fb_unpin(vm->dev) ? -EAGAIN : -ENOSPC; |
74e21ac2 CW |
161 | } |
162 | ||
9332f3b1 CW |
163 | /* Not everything in the GGTT is tracked via vma (otherwise we |
164 | * could evict as required with minimal stalling) so we are forced | |
165 | * to idle the GPU and explicitly retire outstanding requests in | |
166 | * the hopes that we can then remove contexts and the like only | |
167 | * bound by their active reference. | |
74e21ac2 | 168 | */ |
9332f3b1 CW |
169 | ret = i915_gem_switch_to_kernel_context(dev_priv); |
170 | if (ret) | |
171 | return ret; | |
172 | ||
dcff85c8 | 173 | ret = i915_gem_wait_for_idle(dev_priv, true); |
9332f3b1 CW |
174 | if (ret) |
175 | return ret; | |
176 | ||
177 | i915_gem_retire_requests(dev_priv); | |
178 | goto search_again; | |
cd377ea9 CW |
179 | |
180 | found: | |
e39a0150 | 181 | /* drm_mm doesn't allow any other other operations while |
9332f3b1 CW |
182 | * scanning, therefore store to-be-evicted objects on a |
183 | * temporary list and take a reference for all before | |
184 | * calling unbind (which may remove the active reference | |
185 | * of any of our objects, thus corrupting the list). | |
186 | */ | |
187 | list_for_each_entry_safe(vma, next, &eviction_list, exec_list) { | |
188 | if (drm_mm_scan_remove_block(&vma->node)) | |
20dfbde4 | 189 | __i915_vma_pin(vma); |
9332f3b1 CW |
190 | else |
191 | list_del_init(&vma->exec_list); | |
cd377ea9 | 192 | } |
b47eb4a2 | 193 | |
cd377ea9 | 194 | /* Unbinding will emit any required flushes */ |
e39a0150 | 195 | while (!list_empty(&eviction_list)) { |
82a55ad1 BW |
196 | vma = list_first_entry(&eviction_list, |
197 | struct i915_vma, | |
432e58ed | 198 | exec_list); |
8637b407 | 199 | |
8637b407 | 200 | list_del_init(&vma->exec_list); |
20dfbde4 | 201 | __i915_vma_unpin(vma); |
e39a0150 | 202 | if (ret == 0) |
82a55ad1 | 203 | ret = i915_vma_unbind(vma); |
b47eb4a2 | 204 | } |
e39a0150 | 205 | return ret; |
b47eb4a2 CW |
206 | } |
207 | ||
506a8e87 CW |
208 | int |
209 | i915_gem_evict_for_vma(struct i915_vma *target) | |
210 | { | |
211 | struct drm_mm_node *node, *next; | |
212 | ||
213 | list_for_each_entry_safe(node, next, | |
214 | &target->vm->mm.head_node.node_list, | |
215 | node_list) { | |
216 | struct i915_vma *vma; | |
217 | int ret; | |
218 | ||
219 | if (node->start + node->size <= target->node.start) | |
220 | continue; | |
221 | if (node->start >= target->node.start + target->node.size) | |
222 | break; | |
223 | ||
224 | vma = container_of(node, typeof(*vma), node); | |
225 | ||
20dfbde4 CW |
226 | if (i915_vma_is_pinned(vma)) { |
227 | if (!vma->exec_entry || i915_vma_pin_count(vma) > 1) | |
506a8e87 CW |
228 | /* Object is pinned for some other use */ |
229 | return -EBUSY; | |
230 | ||
231 | /* We need to evict a buffer in the same batch */ | |
232 | if (vma->exec_entry->flags & EXEC_OBJECT_PINNED) | |
233 | /* Overlapping fixed objects in the same batch */ | |
234 | return -EINVAL; | |
235 | ||
236 | return -ENOSPC; | |
237 | } | |
238 | ||
239 | ret = i915_vma_unbind(vma); | |
240 | if (ret) | |
241 | return ret; | |
242 | } | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
68c8c17f | 247 | /** |
c2c1d491 | 248 | * i915_gem_evict_vm - Evict all idle vmas from a vm |
c2c1d491 | 249 | * @vm: Address space to cleanse |
68c8c17f BW |
250 | * @do_idle: Boolean directing whether to idle first. |
251 | * | |
c2c1d491 DV |
252 | * This function evicts all idles vmas from a vm. If all unpinned vmas should be |
253 | * evicted the @do_idle needs to be set to true. | |
68c8c17f | 254 | * |
c2c1d491 DV |
255 | * This is used by the execbuf code as a last-ditch effort to defragment the |
256 | * address space. | |
257 | * | |
258 | * To clarify: This is for freeing up virtual address space, not for freeing | |
259 | * memory in e.g. the shrinker. | |
68c8c17f BW |
260 | */ |
261 | int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle) | |
7b796122 BW |
262 | { |
263 | struct i915_vma *vma, *next; | |
264 | int ret; | |
265 | ||
b9b5dce5 | 266 | WARN_ON(!mutex_is_locked(&vm->dev->struct_mutex)); |
bcccff84 BW |
267 | trace_i915_gem_evict_vm(vm); |
268 | ||
7b796122 | 269 | if (do_idle) { |
6e5a5beb CW |
270 | struct drm_i915_private *dev_priv = to_i915(vm->dev); |
271 | ||
883445d4 | 272 | if (i915_is_ggtt(vm)) { |
945657b4 | 273 | ret = i915_gem_switch_to_kernel_context(dev_priv); |
883445d4 CW |
274 | if (ret) |
275 | return ret; | |
276 | } | |
6e5a5beb | 277 | |
dcff85c8 | 278 | ret = i915_gem_wait_for_idle(dev_priv, true); |
7b796122 BW |
279 | if (ret) |
280 | return ret; | |
281 | ||
6e5a5beb | 282 | i915_gem_retire_requests(dev_priv); |
b9b5dce5 | 283 | WARN_ON(!list_empty(&vm->active_list)); |
7b796122 BW |
284 | } |
285 | ||
1c7f4bca | 286 | list_for_each_entry_safe(vma, next, &vm->inactive_list, vm_link) |
20dfbde4 | 287 | if (!i915_vma_is_pinned(vma)) |
7b796122 BW |
288 | WARN_ON(i915_vma_unbind(vma)); |
289 | ||
290 | return 0; | |
291 | } |