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1 | /* |
2 | * Copyright 2014 Advanced Micro Devices, Inc. | |
3 | * All Rights Reserved. | |
4 | * | |
5 | * Permission is hereby granted, free of charge, to any person obtaining a | |
6 | * copy of this software and associated documentation files (the | |
7 | * "Software"), to deal in the Software without restriction, including | |
8 | * without limitation the rights to use, copy, modify, merge, publish, | |
9 | * distribute, sub license, and/or sell copies of the Software, and to | |
10 | * permit persons to whom the Software is furnished to do so, subject to | |
11 | * the following conditions: | |
12 | * | |
13 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
14 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
15 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL | |
16 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, | |
17 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | |
18 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | |
19 | * USE OR OTHER DEALINGS IN THE SOFTWARE. | |
20 | * | |
21 | * The above copyright notice and this permission notice (including the | |
22 | * next paragraph) shall be included in all copies or substantial portions | |
23 | * of the Software. | |
24 | * | |
25 | */ | |
26 | /* | |
27 | * Authors: | |
28 | * Christian König <christian.koenig@amd.com> | |
29 | */ | |
30 | ||
31 | #include <drm/drmP.h> | |
32 | #include "radeon.h" | |
33 | #include "radeon_trace.h" | |
34 | ||
35 | /** | |
36 | * radeon_sync_create - zero init sync object | |
37 | * | |
38 | * @sync: sync object to initialize | |
39 | * | |
40 | * Just clear the sync object for now. | |
41 | */ | |
42 | void radeon_sync_create(struct radeon_sync *sync) | |
43 | { | |
44 | unsigned i; | |
45 | ||
46 | for (i = 0; i < RADEON_NUM_SYNCS; ++i) | |
47 | sync->semaphores[i] = NULL; | |
48 | ||
49 | for (i = 0; i < RADEON_NUM_RINGS; ++i) | |
50 | sync->sync_to[i] = NULL; | |
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51 | |
52 | sync->last_vm_update = NULL; | |
975700d2 CK |
53 | } |
54 | ||
55 | /** | |
56 | * radeon_sync_fence - use the semaphore to sync to a fence | |
57 | * | |
58 | * @sync: sync object to add fence to | |
59 | * @fence: fence to sync to | |
60 | * | |
61 | * Sync to the fence using the semaphore objects | |
62 | */ | |
63 | void radeon_sync_fence(struct radeon_sync *sync, | |
64 | struct radeon_fence *fence) | |
65 | { | |
66 | struct radeon_fence *other; | |
67 | ||
68 | if (!fence) | |
69 | return; | |
70 | ||
71 | other = sync->sync_to[fence->ring]; | |
72 | sync->sync_to[fence->ring] = radeon_fence_later(fence, other); | |
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73 | |
74 | if (fence->is_vm_update) { | |
75 | other = sync->last_vm_update; | |
76 | sync->last_vm_update = radeon_fence_later(fence, other); | |
77 | } | |
975700d2 CK |
78 | } |
79 | ||
80 | /** | |
81 | * radeon_sync_resv - use the semaphores to sync to a reservation object | |
82 | * | |
83 | * @sync: sync object to add fences from reservation object to | |
84 | * @resv: reservation object with embedded fence | |
85 | * @shared: true if we should only sync to the exclusive fence | |
86 | * | |
87 | * Sync to the fence using the semaphore objects | |
88 | */ | |
89 | int radeon_sync_resv(struct radeon_device *rdev, | |
90 | struct radeon_sync *sync, | |
91 | struct reservation_object *resv, | |
92 | bool shared) | |
93 | { | |
94 | struct reservation_object_list *flist; | |
95 | struct fence *f; | |
96 | struct radeon_fence *fence; | |
97 | unsigned i; | |
98 | int r = 0; | |
99 | ||
100 | /* always sync to the exclusive fence */ | |
101 | f = reservation_object_get_excl(resv); | |
102 | fence = f ? to_radeon_fence(f) : NULL; | |
103 | if (fence && fence->rdev == rdev) | |
104 | radeon_sync_fence(sync, fence); | |
105 | else if (f) | |
106 | r = fence_wait(f, true); | |
107 | ||
108 | flist = reservation_object_get_list(resv); | |
109 | if (shared || !flist || r) | |
110 | return r; | |
111 | ||
112 | for (i = 0; i < flist->shared_count; ++i) { | |
113 | f = rcu_dereference_protected(flist->shared[i], | |
114 | reservation_object_held(resv)); | |
115 | fence = to_radeon_fence(f); | |
116 | if (fence && fence->rdev == rdev) | |
117 | radeon_sync_fence(sync, fence); | |
118 | else | |
119 | r = fence_wait(f, true); | |
120 | ||
121 | if (r) | |
122 | break; | |
123 | } | |
124 | return r; | |
125 | } | |
126 | ||
127 | /** | |
128 | * radeon_sync_rings - sync ring to all registered fences | |
129 | * | |
130 | * @rdev: radeon_device pointer | |
131 | * @sync: sync object to use | |
132 | * @ring: ring that needs sync | |
133 | * | |
134 | * Ensure that all registered fences are signaled before letting | |
135 | * the ring continue. The caller must hold the ring lock. | |
136 | */ | |
137 | int radeon_sync_rings(struct radeon_device *rdev, | |
138 | struct radeon_sync *sync, | |
139 | int ring) | |
140 | { | |
141 | unsigned count = 0; | |
142 | int i, r; | |
143 | ||
144 | for (i = 0; i < RADEON_NUM_RINGS; ++i) { | |
145 | struct radeon_fence *fence = sync->sync_to[i]; | |
146 | struct radeon_semaphore *semaphore; | |
147 | ||
148 | /* check if we really need to sync */ | |
149 | if (!radeon_fence_need_sync(fence, ring)) | |
150 | continue; | |
151 | ||
152 | /* prevent GPU deadlocks */ | |
153 | if (!rdev->ring[i].ready) { | |
154 | dev_err(rdev->dev, "Syncing to a disabled ring!"); | |
155 | return -EINVAL; | |
156 | } | |
157 | ||
158 | if (count >= RADEON_NUM_SYNCS) { | |
159 | /* not enough room, wait manually */ | |
160 | r = radeon_fence_wait(fence, false); | |
161 | if (r) | |
162 | return r; | |
163 | continue; | |
164 | } | |
165 | r = radeon_semaphore_create(rdev, &semaphore); | |
166 | if (r) | |
167 | return r; | |
168 | ||
169 | sync->semaphores[count++] = semaphore; | |
170 | ||
171 | /* allocate enough space for sync command */ | |
172 | r = radeon_ring_alloc(rdev, &rdev->ring[i], 16); | |
173 | if (r) | |
174 | return r; | |
175 | ||
176 | /* emit the signal semaphore */ | |
177 | if (!radeon_semaphore_emit_signal(rdev, i, semaphore)) { | |
178 | /* signaling wasn't successful wait manually */ | |
179 | radeon_ring_undo(&rdev->ring[i]); | |
180 | r = radeon_fence_wait(fence, false); | |
181 | if (r) | |
182 | return r; | |
183 | continue; | |
184 | } | |
185 | ||
186 | /* we assume caller has already allocated space on waiters ring */ | |
187 | if (!radeon_semaphore_emit_wait(rdev, ring, semaphore)) { | |
188 | /* waiting wasn't successful wait manually */ | |
189 | radeon_ring_undo(&rdev->ring[i]); | |
190 | r = radeon_fence_wait(fence, false); | |
191 | if (r) | |
192 | return r; | |
193 | continue; | |
194 | } | |
195 | ||
196 | radeon_ring_commit(rdev, &rdev->ring[i], false); | |
197 | radeon_fence_note_sync(fence, ring); | |
198 | } | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | /** | |
204 | * radeon_sync_free - free the sync object | |
205 | * | |
206 | * @rdev: radeon_device pointer | |
207 | * @sync: sync object to use | |
208 | * @fence: fence to use for the free | |
209 | * | |
210 | * Free the sync object by freeing all semaphores in it. | |
211 | */ | |
212 | void radeon_sync_free(struct radeon_device *rdev, | |
213 | struct radeon_sync *sync, | |
214 | struct radeon_fence *fence) | |
215 | { | |
216 | unsigned i; | |
217 | ||
218 | for (i = 0; i < RADEON_NUM_SYNCS; ++i) | |
219 | radeon_semaphore_free(rdev, &sync->semaphores[i], fence); | |
220 | } |