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c078aa2f TH |
1 | /************************************************************************** |
2 | * | |
3 | * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA | |
4 | * All Rights Reserved. | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a | |
7 | * copy of this software and associated documentation files (the | |
8 | * "Software"), to deal in the Software without restriction, including | |
9 | * without limitation the rights to use, copy, modify, merge, publish, | |
10 | * distribute, sub license, and/or sell copies of the Software, and to | |
11 | * permit persons to whom the Software is furnished to do so, subject to | |
12 | * the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice (including the | |
15 | * next paragraph) shall be included in all copies or substantial portions | |
16 | * of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL | |
21 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, | |
22 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | |
23 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | |
24 | * USE OR OTHER DEALINGS IN THE SOFTWARE. | |
25 | * | |
26 | **************************************************************************/ | |
27 | ||
760285e7 DH |
28 | #include <drm/ttm/ttm_execbuf_util.h> |
29 | #include <drm/ttm/ttm_bo_driver.h> | |
30 | #include <drm/ttm/ttm_placement.h> | |
c078aa2f TH |
31 | #include <linux/wait.h> |
32 | #include <linux/sched.h> | |
33 | #include <linux/module.h> | |
34 | ||
8d17fb44 | 35 | static void ttm_eu_backoff_reservation_locked(struct list_head *list) |
d6ea8886 DA |
36 | { |
37 | struct ttm_validate_buffer *entry; | |
38 | ||
39 | list_for_each_entry(entry, list, head) { | |
40 | struct ttm_buffer_object *bo = entry->bo; | |
41 | if (!entry->reserved) | |
42 | continue; | |
43 | ||
ecff665f | 44 | entry->reserved = false; |
d6ea8886 | 45 | if (entry->removed) { |
34820324 | 46 | ttm_bo_add_to_lru(bo); |
d6ea8886 | 47 | entry->removed = false; |
d6ea8886 | 48 | } |
c7523083 | 49 | __ttm_bo_unreserve(bo); |
d6ea8886 DA |
50 | } |
51 | } | |
52 | ||
53 | static void ttm_eu_del_from_lru_locked(struct list_head *list) | |
54 | { | |
55 | struct ttm_validate_buffer *entry; | |
56 | ||
57 | list_for_each_entry(entry, list, head) { | |
58 | struct ttm_buffer_object *bo = entry->bo; | |
59 | if (!entry->reserved) | |
60 | continue; | |
61 | ||
62 | if (!entry->removed) { | |
63 | entry->put_count = ttm_bo_del_from_lru(bo); | |
64 | entry->removed = true; | |
65 | } | |
66 | } | |
67 | } | |
68 | ||
69 | static void ttm_eu_list_ref_sub(struct list_head *list) | |
70 | { | |
71 | struct ttm_validate_buffer *entry; | |
72 | ||
73 | list_for_each_entry(entry, list, head) { | |
74 | struct ttm_buffer_object *bo = entry->bo; | |
75 | ||
76 | if (entry->put_count) { | |
77 | ttm_bo_list_ref_sub(bo, entry->put_count, true); | |
78 | entry->put_count = 0; | |
79 | } | |
80 | } | |
81 | } | |
82 | ||
ecff665f ML |
83 | void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket, |
84 | struct list_head *list) | |
c078aa2f TH |
85 | { |
86 | struct ttm_validate_buffer *entry; | |
68c4fa31 | 87 | struct ttm_bo_global *glob; |
c078aa2f | 88 | |
68c4fa31 TH |
89 | if (list_empty(list)) |
90 | return; | |
c078aa2f | 91 | |
68c4fa31 TH |
92 | entry = list_first_entry(list, struct ttm_validate_buffer, head); |
93 | glob = entry->bo->glob; | |
94 | spin_lock(&glob->lru_lock); | |
8d17fb44 TH |
95 | ttm_eu_backoff_reservation_locked(list); |
96 | if (ticket) | |
97 | ww_acquire_fini(ticket); | |
68c4fa31 | 98 | spin_unlock(&glob->lru_lock); |
c078aa2f TH |
99 | } |
100 | EXPORT_SYMBOL(ttm_eu_backoff_reservation); | |
101 | ||
102 | /* | |
103 | * Reserve buffers for validation. | |
104 | * | |
105 | * If a buffer in the list is marked for CPU access, we back off and | |
106 | * wait for that buffer to become free for GPU access. | |
107 | * | |
108 | * If a buffer is reserved for another validation, the validator with | |
109 | * the highest validation sequence backs off and waits for that buffer | |
110 | * to become unreserved. This prevents deadlocks when validating multiple | |
111 | * buffers in different orders. | |
112 | */ | |
113 | ||
ecff665f ML |
114 | int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket, |
115 | struct list_head *list) | |
c078aa2f | 116 | { |
d6ea8886 | 117 | struct ttm_bo_global *glob; |
c078aa2f TH |
118 | struct ttm_validate_buffer *entry; |
119 | int ret; | |
120 | ||
d6ea8886 DA |
121 | if (list_empty(list)) |
122 | return 0; | |
123 | ||
124 | list_for_each_entry(entry, list, head) { | |
125 | entry->reserved = false; | |
126 | entry->put_count = 0; | |
127 | entry->removed = false; | |
128 | } | |
129 | ||
130 | entry = list_first_entry(list, struct ttm_validate_buffer, head); | |
131 | glob = entry->bo->glob; | |
132 | ||
8d17fb44 TH |
133 | if (ticket) |
134 | ww_acquire_init(ticket, &reservation_ww_class); | |
f2d476a1 | 135 | retry: |
c078aa2f TH |
136 | list_for_each_entry(entry, list, head) { |
137 | struct ttm_buffer_object *bo = entry->bo; | |
138 | ||
f2d476a1 ML |
139 | /* already slowpath reserved? */ |
140 | if (entry->reserved) | |
141 | continue; | |
142 | ||
c7523083 TH |
143 | ret = __ttm_bo_reserve(bo, true, (ticket == NULL), true, |
144 | ticket); | |
7a186308 | 145 | |
5e338405 ML |
146 | if (ret == -EDEADLK) { |
147 | /* uh oh, we lost out, drop every reservation and try | |
148 | * to only reserve this buffer, then start over if | |
149 | * this succeeds. | |
150 | */ | |
8d17fb44 | 151 | BUG_ON(ticket == NULL); |
5e338405 | 152 | spin_lock(&glob->lru_lock); |
8d17fb44 | 153 | ttm_eu_backoff_reservation_locked(list); |
d6ea8886 DA |
154 | spin_unlock(&glob->lru_lock); |
155 | ttm_eu_list_ref_sub(list); | |
5e338405 ML |
156 | ret = ww_mutex_lock_slow_interruptible(&bo->resv->lock, |
157 | ticket); | |
158 | if (unlikely(ret != 0)) { | |
159 | if (ret == -EINTR) | |
160 | ret = -ERESTARTSYS; | |
ecff665f | 161 | goto err_fini; |
5e338405 | 162 | } |
ecff665f | 163 | |
f2d476a1 ML |
164 | entry->reserved = true; |
165 | if (unlikely(atomic_read(&bo->cpu_writers) > 0)) { | |
166 | ret = -EBUSY; | |
167 | goto err; | |
168 | } | |
d6ea8886 | 169 | goto retry; |
5e338405 | 170 | } else if (ret) |
7a186308 | 171 | goto err; |
c078aa2f TH |
172 | |
173 | entry->reserved = true; | |
174 | if (unlikely(atomic_read(&bo->cpu_writers) > 0)) { | |
7a186308 ML |
175 | ret = -EBUSY; |
176 | goto err; | |
c078aa2f TH |
177 | } |
178 | } | |
d6ea8886 | 179 | |
8d17fb44 TH |
180 | if (ticket) |
181 | ww_acquire_done(ticket); | |
5e338405 | 182 | spin_lock(&glob->lru_lock); |
d6ea8886 DA |
183 | ttm_eu_del_from_lru_locked(list); |
184 | spin_unlock(&glob->lru_lock); | |
185 | ttm_eu_list_ref_sub(list); | |
c078aa2f | 186 | return 0; |
7a186308 ML |
187 | |
188 | err: | |
5e338405 | 189 | spin_lock(&glob->lru_lock); |
8d17fb44 | 190 | ttm_eu_backoff_reservation_locked(list); |
7a186308 ML |
191 | spin_unlock(&glob->lru_lock); |
192 | ttm_eu_list_ref_sub(list); | |
ecff665f | 193 | err_fini: |
8d17fb44 TH |
194 | if (ticket) { |
195 | ww_acquire_done(ticket); | |
196 | ww_acquire_fini(ticket); | |
197 | } | |
7a186308 | 198 | return ret; |
c078aa2f TH |
199 | } |
200 | EXPORT_SYMBOL(ttm_eu_reserve_buffers); | |
201 | ||
ecff665f ML |
202 | void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket, |
203 | struct list_head *list, void *sync_obj) | |
c078aa2f TH |
204 | { |
205 | struct ttm_validate_buffer *entry; | |
95762c2b TH |
206 | struct ttm_buffer_object *bo; |
207 | struct ttm_bo_global *glob; | |
208 | struct ttm_bo_device *bdev; | |
209 | struct ttm_bo_driver *driver; | |
c078aa2f | 210 | |
95762c2b TH |
211 | if (list_empty(list)) |
212 | return; | |
213 | ||
214 | bo = list_first_entry(list, struct ttm_validate_buffer, head)->bo; | |
215 | bdev = bo->bdev; | |
216 | driver = bdev->driver; | |
217 | glob = bo->glob; | |
c078aa2f | 218 | |
95762c2b | 219 | spin_lock(&glob->lru_lock); |
4154f051 | 220 | spin_lock(&bdev->fence_lock); |
95762c2b TH |
221 | |
222 | list_for_each_entry(entry, list, head) { | |
223 | bo = entry->bo; | |
224 | entry->old_sync_obj = bo->sync_obj; | |
c078aa2f | 225 | bo->sync_obj = driver->sync_obj_ref(sync_obj); |
34820324 | 226 | ttm_bo_add_to_lru(bo); |
c7523083 | 227 | __ttm_bo_unreserve(bo); |
c078aa2f | 228 | entry->reserved = false; |
95762c2b | 229 | } |
95762c2b | 230 | spin_unlock(&bdev->fence_lock); |
4154f051 | 231 | spin_unlock(&glob->lru_lock); |
8d17fb44 TH |
232 | if (ticket) |
233 | ww_acquire_fini(ticket); | |
95762c2b TH |
234 | |
235 | list_for_each_entry(entry, list, head) { | |
236 | if (entry->old_sync_obj) | |
237 | driver->sync_obj_unref(&entry->old_sync_obj); | |
c078aa2f TH |
238 | } |
239 | } | |
240 | EXPORT_SYMBOL(ttm_eu_fence_buffer_objects); |