This source file includes following definitions.
- ttm_eu_backoff_reservation_reverse
- ttm_eu_del_from_lru_locked
- ttm_eu_backoff_reservation
- ttm_eu_reserve_buffers
- ttm_eu_fence_buffer_objects
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29 #include <drm/ttm/ttm_execbuf_util.h>
30 #include <drm/ttm/ttm_bo_driver.h>
31 #include <drm/ttm/ttm_placement.h>
32 #include <linux/wait.h>
33 #include <linux/sched.h>
34 #include <linux/module.h>
35
36 static void ttm_eu_backoff_reservation_reverse(struct list_head *list,
37 struct ttm_validate_buffer *entry)
38 {
39 list_for_each_entry_continue_reverse(entry, list, head) {
40 struct ttm_buffer_object *bo = entry->bo;
41
42 dma_resv_unlock(bo->base.resv);
43 }
44 }
45
46 static void ttm_eu_del_from_lru_locked(struct list_head *list)
47 {
48 struct ttm_validate_buffer *entry;
49
50 list_for_each_entry(entry, list, head) {
51 struct ttm_buffer_object *bo = entry->bo;
52 ttm_bo_del_from_lru(bo);
53 }
54 }
55
56 void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,
57 struct list_head *list)
58 {
59 struct ttm_validate_buffer *entry;
60 struct ttm_bo_global *glob;
61
62 if (list_empty(list))
63 return;
64
65 entry = list_first_entry(list, struct ttm_validate_buffer, head);
66 glob = entry->bo->bdev->glob;
67
68 spin_lock(&glob->lru_lock);
69 list_for_each_entry(entry, list, head) {
70 struct ttm_buffer_object *bo = entry->bo;
71
72 if (list_empty(&bo->lru))
73 ttm_bo_add_to_lru(bo);
74 dma_resv_unlock(bo->base.resv);
75 }
76 spin_unlock(&glob->lru_lock);
77
78 if (ticket)
79 ww_acquire_fini(ticket);
80 }
81 EXPORT_SYMBOL(ttm_eu_backoff_reservation);
82
83
84
85
86
87
88
89
90
91
92
93
94
95 int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
96 struct list_head *list, bool intr,
97 struct list_head *dups, bool del_lru)
98 {
99 struct ttm_bo_global *glob;
100 struct ttm_validate_buffer *entry;
101 int ret;
102
103 if (list_empty(list))
104 return 0;
105
106 entry = list_first_entry(list, struct ttm_validate_buffer, head);
107 glob = entry->bo->bdev->glob;
108
109 if (ticket)
110 ww_acquire_init(ticket, &reservation_ww_class);
111
112 list_for_each_entry(entry, list, head) {
113 struct ttm_buffer_object *bo = entry->bo;
114
115 ret = __ttm_bo_reserve(bo, intr, (ticket == NULL), ticket);
116 if (!ret && unlikely(atomic_read(&bo->cpu_writers) > 0)) {
117 dma_resv_unlock(bo->base.resv);
118
119 ret = -EBUSY;
120
121 } else if (ret == -EALREADY && dups) {
122 struct ttm_validate_buffer *safe = entry;
123 entry = list_prev_entry(entry, head);
124 list_del(&safe->head);
125 list_add(&safe->head, dups);
126 continue;
127 }
128
129 if (!ret) {
130 if (!entry->num_shared)
131 continue;
132
133 ret = dma_resv_reserve_shared(bo->base.resv,
134 entry->num_shared);
135 if (!ret)
136 continue;
137 }
138
139
140
141
142
143 ttm_eu_backoff_reservation_reverse(list, entry);
144
145 if (ret == -EDEADLK) {
146 if (intr) {
147 ret = dma_resv_lock_slow_interruptible(bo->base.resv,
148 ticket);
149 } else {
150 dma_resv_lock_slow(bo->base.resv, ticket);
151 ret = 0;
152 }
153 }
154
155 if (!ret && entry->num_shared)
156 ret = dma_resv_reserve_shared(bo->base.resv,
157 entry->num_shared);
158
159 if (unlikely(ret != 0)) {
160 if (ret == -EINTR)
161 ret = -ERESTARTSYS;
162 if (ticket) {
163 ww_acquire_done(ticket);
164 ww_acquire_fini(ticket);
165 }
166 return ret;
167 }
168
169
170
171
172 list_del(&entry->head);
173 list_add(&entry->head, list);
174 }
175
176 if (del_lru) {
177 spin_lock(&glob->lru_lock);
178 ttm_eu_del_from_lru_locked(list);
179 spin_unlock(&glob->lru_lock);
180 }
181 return 0;
182 }
183 EXPORT_SYMBOL(ttm_eu_reserve_buffers);
184
185 void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,
186 struct list_head *list,
187 struct dma_fence *fence)
188 {
189 struct ttm_validate_buffer *entry;
190 struct ttm_buffer_object *bo;
191 struct ttm_bo_global *glob;
192
193 if (list_empty(list))
194 return;
195
196 bo = list_first_entry(list, struct ttm_validate_buffer, head)->bo;
197 glob = bo->bdev->glob;
198
199 spin_lock(&glob->lru_lock);
200
201 list_for_each_entry(entry, list, head) {
202 bo = entry->bo;
203 if (entry->num_shared)
204 dma_resv_add_shared_fence(bo->base.resv, fence);
205 else
206 dma_resv_add_excl_fence(bo->base.resv, fence);
207 if (list_empty(&bo->lru))
208 ttm_bo_add_to_lru(bo);
209 else
210 ttm_bo_move_to_lru_tail(bo, NULL);
211 dma_resv_unlock(bo->base.resv);
212 }
213 spin_unlock(&glob->lru_lock);
214 if (ticket)
215 ww_acquire_fini(ticket);
216 }
217 EXPORT_SYMBOL(ttm_eu_fence_buffer_objects);