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 | |
cd377ea9 | 36 | static bool |
f6cd1f15 | 37 | mark_free(struct i915_vma *vma, struct list_head *unwind) |
b47eb4a2 | 38 | { |
f6cd1f15 | 39 | if (vma->obj->pin_count) |
1b50247a CW |
40 | return false; |
41 | ||
b93dab6e DV |
42 | if (WARN_ON(!list_empty(&vma->exec_list))) |
43 | return false; | |
44 | ||
82a55ad1 | 45 | list_add(&vma->exec_list, unwind); |
2f633156 | 46 | return drm_mm_scan_add_block(&vma->node); |
b47eb4a2 CW |
47 | } |
48 | ||
49 | int | |
f6cd1f15 BW |
50 | i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm, |
51 | int min_size, unsigned alignment, unsigned cache_level, | |
86a1ee26 | 52 | bool mappable, bool nonblocking) |
b47eb4a2 CW |
53 | { |
54 | drm_i915_private_t *dev_priv = dev->dev_private; | |
cd377ea9 | 55 | struct list_head eviction_list, unwind_list; |
2f633156 | 56 | struct i915_vma *vma; |
cd377ea9 | 57 | int ret = 0; |
74e21ac2 | 58 | int pass = 0; |
b47eb4a2 | 59 | |
db53a302 CW |
60 | trace_i915_gem_evict(dev, min_size, alignment, mappable); |
61 | ||
cd377ea9 CW |
62 | /* |
63 | * The goal is to evict objects and amalgamate space in LRU order. | |
64 | * The oldest idle objects reside on the inactive list, which is in | |
65 | * retirement order. The next objects to retire are those on the (per | |
66 | * ring) active list that do not have an outstanding flush. Once the | |
67 | * hardware reports completion (the seqno is updated after the | |
68 | * batchbuffer has been finished) the clean buffer objects would | |
69 | * be retired to the inactive list. Any dirty objects would be added | |
70 | * to the tail of the flushing list. So after processing the clean | |
71 | * active objects we need to emit a MI_FLUSH to retire the flushing | |
72 | * list, hence the retirement order of the flushing list is in | |
73 | * advance of the dirty objects on the active lists. | |
74 | * | |
75 | * The retirement sequence is thus: | |
76 | * 1. Inactive objects (already retired) | |
77 | * 2. Clean active objects | |
78 | * 3. Flushing list | |
79 | * 4. Dirty active objects. | |
80 | * | |
81 | * On each list, the oldest objects lie at the HEAD with the freshest | |
82 | * object on the TAIL. | |
83 | */ | |
84 | ||
85 | INIT_LIST_HEAD(&unwind_list); | |
f6cd1f15 BW |
86 | if (mappable) { |
87 | BUG_ON(!i915_is_ggtt(vm)); | |
5cef07e1 | 88 | drm_mm_init_scan_with_range(&vm->mm, min_size, |
93bd8649 BW |
89 | alignment, cache_level, 0, |
90 | dev_priv->gtt.mappable_end); | |
f6cd1f15 | 91 | } else |
5cef07e1 | 92 | drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level); |
cd377ea9 | 93 | |
ad071acb | 94 | search_again: |
cd377ea9 | 95 | /* First see if there is a large enough contiguous idle region... */ |
ca191b13 | 96 | list_for_each_entry(vma, &vm->inactive_list, mm_list) { |
f6cd1f15 | 97 | if (mark_free(vma, &unwind_list)) |
cd377ea9 CW |
98 | goto found; |
99 | } | |
b47eb4a2 | 100 | |
86a1ee26 CW |
101 | if (nonblocking) |
102 | goto none; | |
b47eb4a2 | 103 | |
cd377ea9 | 104 | /* Now merge in the soon-to-be-expired objects... */ |
ca191b13 | 105 | list_for_each_entry(vma, &vm->active_list, mm_list) { |
f6cd1f15 | 106 | if (mark_free(vma, &unwind_list)) |
cd377ea9 CW |
107 | goto found; |
108 | } | |
109 | ||
86a1ee26 | 110 | none: |
cd377ea9 | 111 | /* Nothing found, clean up and bail out! */ |
092de6f2 | 112 | while (!list_empty(&unwind_list)) { |
82a55ad1 BW |
113 | vma = list_first_entry(&unwind_list, |
114 | struct i915_vma, | |
092de6f2 | 115 | exec_list); |
2f633156 | 116 | ret = drm_mm_scan_remove_block(&vma->node); |
cd377ea9 | 117 | BUG_ON(ret); |
092de6f2 | 118 | |
82a55ad1 | 119 | list_del_init(&vma->exec_list); |
cd377ea9 CW |
120 | } |
121 | ||
ad071acb CW |
122 | /* Can we unpin some objects such as idle hw contents, |
123 | * or pending flips? | |
cd377ea9 | 124 | */ |
74e21ac2 CW |
125 | if (nonblocking) |
126 | return -ENOSPC; | |
ad071acb CW |
127 | |
128 | /* Only idle the GPU and repeat the search once */ | |
74e21ac2 CW |
129 | if (pass++ == 0) { |
130 | ret = i915_gpu_idle(dev); | |
131 | if (ret) | |
132 | return ret; | |
133 | ||
134 | i915_gem_retire_requests(dev); | |
135 | goto search_again; | |
136 | } | |
137 | ||
138 | /* If we still have pending pageflip completions, drop | |
139 | * back to userspace to give our workqueues time to | |
140 | * acquire our locks and unpin the old scanouts. | |
141 | */ | |
142 | return intel_has_pending_fb_unpin(dev) ? -EAGAIN : -ENOSPC; | |
cd377ea9 CW |
143 | |
144 | found: | |
e39a0150 CW |
145 | /* drm_mm doesn't allow any other other operations while |
146 | * scanning, therefore store to be evicted objects on a | |
147 | * temporary list. */ | |
cd377ea9 | 148 | INIT_LIST_HEAD(&eviction_list); |
e39a0150 | 149 | while (!list_empty(&unwind_list)) { |
82a55ad1 BW |
150 | vma = list_first_entry(&unwind_list, |
151 | struct i915_vma, | |
432e58ed | 152 | exec_list); |
2f633156 | 153 | if (drm_mm_scan_remove_block(&vma->node)) { |
82a55ad1 BW |
154 | list_move(&vma->exec_list, &eviction_list); |
155 | drm_gem_object_reference(&vma->obj->base); | |
e39a0150 CW |
156 | continue; |
157 | } | |
82a55ad1 | 158 | list_del_init(&vma->exec_list); |
cd377ea9 | 159 | } |
b47eb4a2 | 160 | |
cd377ea9 | 161 | /* Unbinding will emit any required flushes */ |
e39a0150 | 162 | while (!list_empty(&eviction_list)) { |
8637b407 | 163 | struct drm_gem_object *obj; |
82a55ad1 BW |
164 | vma = list_first_entry(&eviction_list, |
165 | struct i915_vma, | |
432e58ed | 166 | exec_list); |
8637b407 BW |
167 | |
168 | obj = &vma->obj->base; | |
169 | list_del_init(&vma->exec_list); | |
e39a0150 | 170 | if (ret == 0) |
82a55ad1 | 171 | ret = i915_vma_unbind(vma); |
092de6f2 | 172 | |
8637b407 | 173 | drm_gem_object_unreference(obj); |
b47eb4a2 | 174 | } |
cd377ea9 | 175 | |
e39a0150 | 176 | return ret; |
b47eb4a2 CW |
177 | } |
178 | ||
68c8c17f BW |
179 | /** |
180 | * i915_gem_evict_vm - Try to free up VM space | |
181 | * | |
182 | * @vm: Address space to evict from | |
183 | * @do_idle: Boolean directing whether to idle first. | |
184 | * | |
185 | * VM eviction is about freeing up virtual address space. If one wants fine | |
186 | * grained eviction, they should see evict something for more details. In terms | |
187 | * of freeing up actual system memory, this function may not accomplish the | |
188 | * desired result. An object may be shared in multiple address space, and this | |
189 | * function will not assert those objects be freed. | |
190 | * | |
191 | * Using do_idle will result in a more complete eviction because it retires, and | |
192 | * inactivates current BOs. | |
193 | */ | |
194 | int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle) | |
7b796122 BW |
195 | { |
196 | struct i915_vma *vma, *next; | |
197 | int ret; | |
198 | ||
bcccff84 BW |
199 | trace_i915_gem_evict_vm(vm); |
200 | ||
7b796122 BW |
201 | if (do_idle) { |
202 | ret = i915_gpu_idle(vm->dev); | |
203 | if (ret) | |
204 | return ret; | |
205 | ||
206 | i915_gem_retire_requests(vm->dev); | |
207 | } | |
208 | ||
209 | list_for_each_entry_safe(vma, next, &vm->inactive_list, mm_list) | |
210 | if (vma->obj->pin_count == 0) | |
211 | WARN_ON(i915_vma_unbind(vma)); | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
b47eb4a2 | 216 | int |
6c085a72 | 217 | i915_gem_evict_everything(struct drm_device *dev) |
b47eb4a2 CW |
218 | { |
219 | drm_i915_private_t *dev_priv = dev->dev_private; | |
f6cd1f15 | 220 | struct i915_address_space *vm; |
f6cd1f15 | 221 | bool lists_empty = true; |
b4519513 | 222 | int ret; |
b47eb4a2 | 223 | |
f6cd1f15 BW |
224 | list_for_each_entry(vm, &dev_priv->vm_list, global_link) { |
225 | lists_empty = (list_empty(&vm->inactive_list) && | |
226 | list_empty(&vm->active_list)); | |
227 | if (!lists_empty) | |
228 | lists_empty = false; | |
229 | } | |
230 | ||
b47eb4a2 CW |
231 | if (lists_empty) |
232 | return -ENOSPC; | |
233 | ||
6c085a72 | 234 | trace_i915_gem_evict_everything(dev); |
db53a302 | 235 | |
b2da9fe5 BW |
236 | /* The gpu_idle will flush everything in the write domain to the |
237 | * active list. Then we must move everything off the active list | |
238 | * with retire requests. | |
239 | */ | |
b4519513 CW |
240 | ret = i915_gpu_idle(dev); |
241 | if (ret) | |
242 | return ret; | |
b2da9fe5 BW |
243 | |
244 | i915_gem_retire_requests(dev); | |
245 | ||
a39d7efc | 246 | /* Having flushed everything, unbind() should never raise an error */ |
7b796122 BW |
247 | list_for_each_entry(vm, &dev_priv->vm_list, global_link) |
248 | WARN_ON(i915_gem_evict_vm(vm, false)); | |
b47eb4a2 | 249 | |
b4519513 | 250 | return 0; |
b47eb4a2 | 251 | } |