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 #include "radeon_trace.h"
33 
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);
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 
53 	*((uint64_t *)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
54 
55 	return 0;
56 }
57 
58 bool radeon_semaphore_emit_signal(struct radeon_device *rdev, int ridx,
59 			          struct radeon_semaphore *semaphore)
60 {
61 	struct radeon_ring *ring = &rdev->ring[ridx];
62 
63 	trace_radeon_semaphore_signale(ridx, semaphore);
64 
65 	if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, false)) {
66 		--semaphore->waiters;
67 
68 		/* for debugging lockup only, used by sysfs debug files */
69 		ring->last_semaphore_signal_addr = semaphore->gpu_addr;
70 		return true;
71 	}
72 	return false;
73 }
74 
75 bool radeon_semaphore_emit_wait(struct radeon_device *rdev, int ridx,
76 			        struct radeon_semaphore *semaphore)
77 {
78 	struct radeon_ring *ring = &rdev->ring[ridx];
79 
80 	trace_radeon_semaphore_wait(ridx, semaphore);
81 
82 	if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, true)) {
83 		++semaphore->waiters;
84 
85 		/* for debugging lockup only, used by sysfs debug files */
86 		ring->last_semaphore_wait_addr = semaphore->gpu_addr;
87 		return true;
88 	}
89 	return false;
90 }
91 
92 void radeon_semaphore_free(struct radeon_device *rdev,
93 			   struct radeon_semaphore **semaphore,
94 			   struct radeon_fence *fence)
95 {
96 	if (semaphore == NULL || *semaphore == NULL) {
97 		return;
98 	}
99 	if ((*semaphore)->waiters > 0) {
100 		dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
101 			" hardware lockup imminent!\n", *semaphore);
102 	}
103 	radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
104 	kfree(*semaphore);
105 	*semaphore = NULL;
106 }
107