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 K├Ânig <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 */
42void 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 */
63void 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 */
89int 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 dma_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 = dma_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 = dma_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 */
137int 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 */
212void 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}
221