Merge ath-next from ath.git
[firefly-linux-kernel-4.4.55.git] / drivers / gpu / drm / radeon / radeon_sync.c
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;
51
52         sync->last_vm_update = NULL;
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);
73
74         if (fence->is_vm_update) {
75                 other = sync->last_vm_update;
76                 sync->last_vm_update = radeon_fence_later(fence, other);
77         }
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 }