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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 | ||
28 | #include "ttm/ttm_execbuf_util.h" | |
29 | #include "ttm/ttm_bo_driver.h" | |
30 | #include "ttm/ttm_placement.h" | |
31 | #include <linux/wait.h> | |
32 | #include <linux/sched.h> | |
33 | #include <linux/module.h> | |
34 | ||
d6ea8886 DA |
35 | static void ttm_eu_backoff_reservation_locked(struct list_head *list) |
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 | ||
44 | if (entry->removed) { | |
45 | ttm_bo_add_to_lru(bo); | |
46 | entry->removed = false; | |
47 | ||
48 | } | |
49 | entry->reserved = false; | |
50 | atomic_set(&bo->reserved, 0); | |
51 | wake_up_all(&bo->event_queue); | |
52 | } | |
53 | } | |
54 | ||
55 | static void ttm_eu_del_from_lru_locked(struct list_head *list) | |
56 | { | |
57 | struct ttm_validate_buffer *entry; | |
58 | ||
59 | list_for_each_entry(entry, list, head) { | |
60 | struct ttm_buffer_object *bo = entry->bo; | |
61 | if (!entry->reserved) | |
62 | continue; | |
63 | ||
64 | if (!entry->removed) { | |
65 | entry->put_count = ttm_bo_del_from_lru(bo); | |
66 | entry->removed = true; | |
67 | } | |
68 | } | |
69 | } | |
70 | ||
71 | static void ttm_eu_list_ref_sub(struct list_head *list) | |
72 | { | |
73 | struct ttm_validate_buffer *entry; | |
74 | ||
75 | list_for_each_entry(entry, list, head) { | |
76 | struct ttm_buffer_object *bo = entry->bo; | |
77 | ||
78 | if (entry->put_count) { | |
79 | ttm_bo_list_ref_sub(bo, entry->put_count, true); | |
80 | entry->put_count = 0; | |
81 | } | |
82 | } | |
83 | } | |
84 | ||
85 | static int ttm_eu_wait_unreserved_locked(struct list_head *list, | |
86 | struct ttm_buffer_object *bo) | |
87 | { | |
88 | struct ttm_bo_global *glob = bo->glob; | |
89 | int ret; | |
90 | ||
91 | ttm_eu_del_from_lru_locked(list); | |
92 | spin_unlock(&glob->lru_lock); | |
93 | ret = ttm_bo_wait_unreserved(bo, true); | |
94 | spin_lock(&glob->lru_lock); | |
95 | if (unlikely(ret != 0)) | |
96 | ttm_eu_backoff_reservation_locked(list); | |
97 | return ret; | |
98 | } | |
99 | ||
100 | ||
c078aa2f TH |
101 | void ttm_eu_backoff_reservation(struct list_head *list) |
102 | { | |
103 | struct ttm_validate_buffer *entry; | |
68c4fa31 | 104 | struct ttm_bo_global *glob; |
c078aa2f | 105 | |
68c4fa31 TH |
106 | if (list_empty(list)) |
107 | return; | |
c078aa2f | 108 | |
68c4fa31 TH |
109 | entry = list_first_entry(list, struct ttm_validate_buffer, head); |
110 | glob = entry->bo->glob; | |
111 | spin_lock(&glob->lru_lock); | |
112 | ttm_eu_backoff_reservation_locked(list); | |
113 | spin_unlock(&glob->lru_lock); | |
c078aa2f TH |
114 | } |
115 | EXPORT_SYMBOL(ttm_eu_backoff_reservation); | |
116 | ||
117 | /* | |
118 | * Reserve buffers for validation. | |
119 | * | |
120 | * If a buffer in the list is marked for CPU access, we back off and | |
121 | * wait for that buffer to become free for GPU access. | |
122 | * | |
123 | * If a buffer is reserved for another validation, the validator with | |
124 | * the highest validation sequence backs off and waits for that buffer | |
125 | * to become unreserved. This prevents deadlocks when validating multiple | |
126 | * buffers in different orders. | |
127 | */ | |
128 | ||
65705962 | 129 | int ttm_eu_reserve_buffers(struct list_head *list) |
c078aa2f | 130 | { |
d6ea8886 | 131 | struct ttm_bo_global *glob; |
c078aa2f TH |
132 | struct ttm_validate_buffer *entry; |
133 | int ret; | |
65705962 | 134 | uint32_t val_seq; |
c078aa2f | 135 | |
d6ea8886 DA |
136 | if (list_empty(list)) |
137 | return 0; | |
138 | ||
139 | list_for_each_entry(entry, list, head) { | |
140 | entry->reserved = false; | |
141 | entry->put_count = 0; | |
142 | entry->removed = false; | |
143 | } | |
144 | ||
145 | entry = list_first_entry(list, struct ttm_validate_buffer, head); | |
146 | glob = entry->bo->glob; | |
147 | ||
c078aa2f | 148 | retry: |
d6ea8886 | 149 | spin_lock(&glob->lru_lock); |
65705962 TH |
150 | val_seq = entry->bo->bdev->val_seq++; |
151 | ||
c078aa2f TH |
152 | list_for_each_entry(entry, list, head) { |
153 | struct ttm_buffer_object *bo = entry->bo; | |
154 | ||
d6ea8886 DA |
155 | retry_this_bo: |
156 | ret = ttm_bo_reserve_locked(bo, true, true, true, val_seq); | |
157 | switch (ret) { | |
158 | case 0: | |
159 | break; | |
160 | case -EBUSY: | |
161 | ret = ttm_eu_wait_unreserved_locked(list, bo); | |
162 | if (unlikely(ret != 0)) { | |
163 | spin_unlock(&glob->lru_lock); | |
164 | ttm_eu_list_ref_sub(list); | |
165 | return ret; | |
166 | } | |
167 | goto retry_this_bo; | |
168 | case -EAGAIN: | |
169 | ttm_eu_backoff_reservation_locked(list); | |
170 | spin_unlock(&glob->lru_lock); | |
171 | ttm_eu_list_ref_sub(list); | |
172 | ret = ttm_bo_wait_unreserved(bo, true); | |
173 | if (unlikely(ret != 0)) | |
c078aa2f | 174 | return ret; |
d6ea8886 DA |
175 | goto retry; |
176 | default: | |
177 | ttm_eu_backoff_reservation_locked(list); | |
178 | spin_unlock(&glob->lru_lock); | |
179 | ttm_eu_list_ref_sub(list); | |
180 | return ret; | |
c078aa2f TH |
181 | } |
182 | ||
183 | entry->reserved = true; | |
184 | if (unlikely(atomic_read(&bo->cpu_writers) > 0)) { | |
d6ea8886 DA |
185 | ttm_eu_backoff_reservation_locked(list); |
186 | spin_unlock(&glob->lru_lock); | |
187 | ttm_eu_list_ref_sub(list); | |
c078aa2f TH |
188 | ret = ttm_bo_wait_cpu(bo, false); |
189 | if (ret) | |
190 | return ret; | |
191 | goto retry; | |
192 | } | |
193 | } | |
d6ea8886 DA |
194 | |
195 | ttm_eu_del_from_lru_locked(list); | |
196 | spin_unlock(&glob->lru_lock); | |
197 | ttm_eu_list_ref_sub(list); | |
198 | ||
c078aa2f TH |
199 | return 0; |
200 | } | |
201 | EXPORT_SYMBOL(ttm_eu_reserve_buffers); | |
202 | ||
203 | void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj) | |
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 TH |
219 | spin_lock(&bdev->fence_lock); |
220 | spin_lock(&glob->lru_lock); | |
221 | ||
222 | list_for_each_entry(entry, list, head) { | |
223 | bo = entry->bo; | |
224 | entry->old_sync_obj = bo->sync_obj; | |
c078aa2f TH |
225 | bo->sync_obj = driver->sync_obj_ref(sync_obj); |
226 | bo->sync_obj_arg = entry->new_sync_obj_arg; | |
95762c2b | 227 | ttm_bo_unreserve_locked(bo); |
c078aa2f | 228 | entry->reserved = false; |
95762c2b TH |
229 | } |
230 | spin_unlock(&glob->lru_lock); | |
231 | spin_unlock(&bdev->fence_lock); | |
232 | ||
233 | list_for_each_entry(entry, list, head) { | |
234 | if (entry->old_sync_obj) | |
235 | driver->sync_obj_unref(&entry->old_sync_obj); | |
c078aa2f TH |
236 | } |
237 | } | |
238 | EXPORT_SYMBOL(ttm_eu_fence_buffer_objects); |