1 /*
2 * Copyright 2011 Christian König.
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 <deathsimple@vodafone.de>
29 */
30 #include <drm/drmP.h>
31 #include "radeon.h"
32
33
radeon_semaphore_create(struct radeon_device * rdev,struct radeon_semaphore ** semaphore)34 int radeon_semaphore_create(struct radeon_device *rdev,
35 struct radeon_semaphore **semaphore)
36 {
37 int r;
38
39 *semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
40 if (*semaphore == NULL) {
41 return -ENOMEM;
42 }
43 r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo,
44 &(*semaphore)->sa_bo, 8, 8, true);
45 if (r) {
46 kfree(*semaphore);
47 *semaphore = NULL;
48 return r;
49 }
50 (*semaphore)->waiters = 0;
51 (*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo);
52 *((uint64_t*)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
53 return 0;
54 }
55
radeon_semaphore_emit_signal(struct radeon_device * rdev,int ring,struct radeon_semaphore * semaphore)56 void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring,
57 struct radeon_semaphore *semaphore)
58 {
59 --semaphore->waiters;
60 radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, false);
61 }
62
radeon_semaphore_emit_wait(struct radeon_device * rdev,int ring,struct radeon_semaphore * semaphore)63 void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
64 struct radeon_semaphore *semaphore)
65 {
66 ++semaphore->waiters;
67 radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, true);
68 }
69
70 /* caller must hold ring lock */
radeon_semaphore_sync_rings(struct radeon_device * rdev,struct radeon_semaphore * semaphore,int signaler,int waiter)71 int radeon_semaphore_sync_rings(struct radeon_device *rdev,
72 struct radeon_semaphore *semaphore,
73 int signaler, int waiter)
74 {
75 int r;
76
77 /* no need to signal and wait on the same ring */
78 if (signaler == waiter) {
79 return 0;
80 }
81
82 /* prevent GPU deadlocks */
83 if (!rdev->ring[signaler].ready) {
84 dev_err(rdev->dev, "Trying to sync to a disabled ring!");
85 return -EINVAL;
86 }
87
88 r = radeon_ring_alloc(rdev, &rdev->ring[signaler], 8);
89 if (r) {
90 return r;
91 }
92 radeon_semaphore_emit_signal(rdev, signaler, semaphore);
93 radeon_ring_commit(rdev, &rdev->ring[signaler]);
94
95 /* we assume caller has already allocated space on waiters ring */
96 radeon_semaphore_emit_wait(rdev, waiter, semaphore);
97
98 /* for debugging lockup only, used by sysfs debug files */
99 rdev->ring[signaler].last_semaphore_signal_addr = semaphore->gpu_addr;
100 rdev->ring[waiter].last_semaphore_wait_addr = semaphore->gpu_addr;
101
102 return 0;
103 }
104
radeon_semaphore_free(struct radeon_device * rdev,struct radeon_semaphore ** semaphore,struct radeon_fence * fence)105 void radeon_semaphore_free(struct radeon_device *rdev,
106 struct radeon_semaphore **semaphore,
107 struct radeon_fence *fence)
108 {
109 if (semaphore == NULL || *semaphore == NULL) {
110 return;
111 }
112 if ((*semaphore)->waiters > 0) {
113 dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
114 " hardware lockup imminent!\n", *semaphore);
115 }
116 radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
117 kfree(*semaphore);
118 *semaphore = NULL;
119 }
120