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 "radeon.h"
32 #include "radeon_trace.h"
33
34 /**
35 * radeon_sync_create - zero init sync object
36 *
37 * @sync: sync object to initialize
38 *
39 * Just clear the sync object for now.
40 */
41 void radeon_sync_create(struct radeon_sync *sync)
42 {
43 unsigned i;
44
45 for (i = 0; i < RADEON_NUM_SYNCS; ++i)
46 sync->semaphores[i] = NULL;
47
48 for (i = 0; i < RADEON_NUM_RINGS; ++i)
49 sync->sync_to[i] = NULL;
50
51 sync->last_vm_update = NULL;
52 }
53
54 /**
55 * radeon_sync_fence - use the semaphore to sync to a fence
56 *
57 * @sync: sync object to add fence to
58 * @fence: fence to sync to
59 *
60 * Sync to the fence using the semaphore objects
61 */
62 void radeon_sync_fence(struct radeon_sync *sync,
63 struct radeon_fence *fence)
64 {
65 struct radeon_fence *other;
66
67 if (!fence)
68 return;
69
70 other = sync->sync_to[fence->ring];
71 sync->sync_to[fence->ring] = radeon_fence_later(fence, other);
72
73 if (fence->is_vm_update) {
74 other = sync->last_vm_update;
75 sync->last_vm_update = radeon_fence_later(fence, other);
76 }
77 }
78
79 /**
80 * radeon_sync_resv - use the semaphores to sync to a reservation object
81 *
82 * @sync: sync object to add fences from reservation object to
83 * @resv: reservation object with embedded fence
84 * @shared: true if we should only sync to the exclusive fence
85 *
86 * Sync to the fence using the semaphore objects
87 */
88 int radeon_sync_resv(struct radeon_device *rdev,
89 struct radeon_sync *sync,
90 struct dma_resv *resv,
91 bool shared)
92 {
93 struct dma_resv_list *flist;
94 struct dma_fence *f;
95 struct radeon_fence *fence;
96 unsigned i;
97 int r = 0;
98
99 /* always sync to the exclusive fence */
100 f = dma_resv_get_excl(resv);
101 fence = f ? to_radeon_fence(f) : NULL;
102 if (fence && fence->rdev == rdev)
103 radeon_sync_fence(sync, fence);
104 else if (f)
105 r = dma_fence_wait(f, true);
106
107 flist = dma_resv_get_list(resv);
108 if (shared || !flist || r)
109 return r;
110
111 for (i = 0; i < flist->shared_count; ++i) {
112 f = rcu_dereference_protected(flist->shared[i],
113 dma_resv_held(resv));
114 fence = to_radeon_fence(f);
115 if (fence && fence->rdev == rdev)
116 radeon_sync_fence(sync, fence);
117 else
118 r = dma_fence_wait(f, true);
119
120 if (r)
121 break;
122 }
123 return r;
124 }
125
126 /**
127 * radeon_sync_rings - sync ring to all registered fences
128 *
129 * @rdev: radeon_device pointer
130 * @sync: sync object to use
131 * @ring: ring that needs sync
132 *
133 * Ensure that all registered fences are signaled before letting
134 * the ring continue. The caller must hold the ring lock.
135 */
136 int radeon_sync_rings(struct radeon_device *rdev,
137 struct radeon_sync *sync,
138 int ring)
139 {
140 unsigned count = 0;
141 int i, r;
142
143 for (i = 0; i < RADEON_NUM_RINGS; ++i) {
144 struct radeon_fence *fence = sync->sync_to[i];
145 struct radeon_semaphore *semaphore;
146
147 /* check if we really need to sync */
148 if (!radeon_fence_need_sync(fence, ring))
149 continue;
150
151 /* prevent GPU deadlocks */
152 if (!rdev->ring[i].ready) {
153 dev_err(rdev->dev, "Syncing to a disabled ring!");
154 return -EINVAL;
155 }
156
157 if (count >= RADEON_NUM_SYNCS) {
158 /* not enough room, wait manually */
159 r = radeon_fence_wait(fence, false);
160 if (r)
161 return r;
162 continue;
163 }
164 r = radeon_semaphore_create(rdev, &semaphore);
165 if (r)
166 return r;
167
168 sync->semaphores[count++] = semaphore;
169
170 /* allocate enough space for sync command */
171 r = radeon_ring_alloc(rdev, &rdev->ring[i], 16);
172 if (r)
173 return r;
174
175 /* emit the signal semaphore */
176 if (!radeon_semaphore_emit_signal(rdev, i, semaphore)) {
177 /* signaling wasn't successful wait manually */
178 radeon_ring_undo(&rdev->ring[i]);
179 r = radeon_fence_wait(fence, false);
180 if (r)
181 return r;
182 continue;
183 }
184
185 /* we assume caller has already allocated space on waiters ring */
186 if (!radeon_semaphore_emit_wait(rdev, ring, semaphore)) {
187 /* waiting wasn't successful wait manually */
188 radeon_ring_undo(&rdev->ring[i]);
189 r = radeon_fence_wait(fence, false);
190 if (r)
191 return r;
192 continue;
193 }
194
195 radeon_ring_commit(rdev, &rdev->ring[i], false);
196 radeon_fence_note_sync(fence, ring);
197 }
198
199 return 0;
200 }
201
202 /**
203 * radeon_sync_free - free the sync object
204 *
205 * @rdev: radeon_device pointer
206 * @sync: sync object to use
207 * @fence: fence to use for the free
208 *
209 * Free the sync object by freeing all semaphores in it.
210 */
211 void radeon_sync_free(struct radeon_device *rdev,
212 struct radeon_sync *sync,
213 struct radeon_fence *fence)
214 {
215 unsigned i;
216
217 for (i = 0; i < RADEON_NUM_SYNCS; ++i)
218 radeon_semaphore_free(rdev, &sync->semaphores[i], fence);
219 }