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1/*
2 * Copyright (C) 2015 Red Hat, Inc.
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a 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, sublicense, 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 above copyright notice and this permission notice (including the
14 * next paragraph) shall be included in all copies or substantial
15 * portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26#include <drm/drmP.h>
27#include "virtgpu_drv.h"
28
29static const char *virtio_get_driver_name(struct fence *f)
30{
31 return "virtio_gpu";
32}
33
34static const char *virtio_get_timeline_name(struct fence *f)
35{
36 return "controlq";
37}
38
39static bool virtio_enable_signaling(struct fence *f)
40{
41 return true;
42}
43
44static bool virtio_signaled(struct fence *f)
45{
46 struct virtio_gpu_fence *fence = to_virtio_fence(f);
47
48 if (atomic64_read(&fence->drv->last_seq) >= fence->seq)
49 return true;
50 return false;
51}
52
53static void virtio_fence_value_str(struct fence *f, char *str, int size)
54{
55 struct virtio_gpu_fence *fence = to_virtio_fence(f);
56
57 snprintf(str, size, "%llu", fence->seq);
58}
59
60static void virtio_timeline_value_str(struct fence *f, char *str, int size)
61{
62 struct virtio_gpu_fence *fence = to_virtio_fence(f);
63
64 snprintf(str, size, "%llu", (u64)atomic64_read(&fence->drv->last_seq));
65}
66
67static const struct fence_ops virtio_fence_ops = {
68 .get_driver_name = virtio_get_driver_name,
69 .get_timeline_name = virtio_get_timeline_name,
70 .enable_signaling = virtio_enable_signaling,
71 .signaled = virtio_signaled,
72 .wait = fence_default_wait,
73 .fence_value_str = virtio_fence_value_str,
74 .timeline_value_str = virtio_timeline_value_str,
75};
76
77int virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
78 struct virtio_gpu_ctrl_hdr *cmd_hdr,
79 struct virtio_gpu_fence **fence)
80{
81 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
82 unsigned long irq_flags;
83
84 *fence = kmalloc(sizeof(struct virtio_gpu_fence), GFP_ATOMIC);
85 if ((*fence) == NULL)
86 return -ENOMEM;
87
88 spin_lock_irqsave(&drv->lock, irq_flags);
89 (*fence)->drv = drv;
90 (*fence)->seq = ++drv->sync_seq;
91 fence_init(&(*fence)->f, &virtio_fence_ops, &drv->lock,
92 0, (*fence)->seq);
93 fence_get(&(*fence)->f);
94 list_add_tail(&(*fence)->node, &drv->fences);
95 spin_unlock_irqrestore(&drv->lock, irq_flags);
96
97 cmd_hdr->flags |= cpu_to_le32(VIRTIO_GPU_FLAG_FENCE);
98 cmd_hdr->fence_id = cpu_to_le64((*fence)->seq);
99 return 0;
100}
101
102void virtio_gpu_fence_event_process(struct virtio_gpu_device *vgdev,
103 u64 last_seq)
104{
105 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
106 struct virtio_gpu_fence *fence, *tmp;
107 unsigned long irq_flags;
108
109 spin_lock_irqsave(&drv->lock, irq_flags);
110 atomic64_set(&vgdev->fence_drv.last_seq, last_seq);
111 list_for_each_entry_safe(fence, tmp, &drv->fences, node) {
112 if (last_seq < fence->seq)
113 continue;
114 fence_signal_locked(&fence->f);
115 list_del(&fence->node);
116 fence_put(&fence->f);
117 }
118 spin_unlock_irqrestore(&drv->lock, irq_flags);
119}
1/*
2 * Copyright (C) 2015 Red Hat, Inc.
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a 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, sublicense, 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 above copyright notice and this permission notice (including the
14 * next paragraph) shall be included in all copies or substantial
15 * portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26#include <trace/events/dma_fence.h>
27
28#include "virtgpu_drv.h"
29
30#define to_virtio_gpu_fence(x) \
31 container_of(x, struct virtio_gpu_fence, f)
32
33static const char *virtio_gpu_get_driver_name(struct dma_fence *f)
34{
35 return "virtio_gpu";
36}
37
38static const char *virtio_gpu_get_timeline_name(struct dma_fence *f)
39{
40 return "controlq";
41}
42
43static bool virtio_gpu_fence_signaled(struct dma_fence *f)
44{
45 /* leaked fence outside driver before completing
46 * initialization with virtio_gpu_fence_emit.
47 */
48 WARN_ON_ONCE(f->seqno == 0);
49 return false;
50}
51
52static void virtio_gpu_fence_value_str(struct dma_fence *f, char *str, int size)
53{
54 snprintf(str, size, "[%llu, %llu]", f->context, f->seqno);
55}
56
57static void virtio_gpu_timeline_value_str(struct dma_fence *f, char *str,
58 int size)
59{
60 struct virtio_gpu_fence *fence = to_virtio_gpu_fence(f);
61
62 snprintf(str, size, "%llu",
63 (u64)atomic64_read(&fence->drv->last_fence_id));
64}
65
66static const struct dma_fence_ops virtio_gpu_fence_ops = {
67 .get_driver_name = virtio_gpu_get_driver_name,
68 .get_timeline_name = virtio_gpu_get_timeline_name,
69 .signaled = virtio_gpu_fence_signaled,
70 .fence_value_str = virtio_gpu_fence_value_str,
71 .timeline_value_str = virtio_gpu_timeline_value_str,
72};
73
74struct virtio_gpu_fence *virtio_gpu_fence_alloc(struct virtio_gpu_device *vgdev)
75{
76 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
77 struct virtio_gpu_fence *fence = kzalloc(sizeof(struct virtio_gpu_fence),
78 GFP_KERNEL);
79 if (!fence)
80 return fence;
81
82 fence->drv = drv;
83
84 /* This only partially initializes the fence because the seqno is
85 * unknown yet. The fence must not be used outside of the driver
86 * until virtio_gpu_fence_emit is called.
87 */
88 dma_fence_init(&fence->f, &virtio_gpu_fence_ops, &drv->lock, drv->context,
89 0);
90
91 return fence;
92}
93
94void virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
95 struct virtio_gpu_ctrl_hdr *cmd_hdr,
96 struct virtio_gpu_fence *fence)
97{
98 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
99 unsigned long irq_flags;
100
101 spin_lock_irqsave(&drv->lock, irq_flags);
102 fence->fence_id = fence->f.seqno = ++drv->current_fence_id;
103 dma_fence_get(&fence->f);
104 list_add_tail(&fence->node, &drv->fences);
105 spin_unlock_irqrestore(&drv->lock, irq_flags);
106
107 trace_dma_fence_emit(&fence->f);
108
109 cmd_hdr->flags |= cpu_to_le32(VIRTIO_GPU_FLAG_FENCE);
110 cmd_hdr->fence_id = cpu_to_le64(fence->fence_id);
111}
112
113void virtio_gpu_fence_event_process(struct virtio_gpu_device *vgdev,
114 u64 fence_id)
115{
116 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
117 struct virtio_gpu_fence *signaled, *curr, *tmp;
118 unsigned long irq_flags;
119
120 spin_lock_irqsave(&drv->lock, irq_flags);
121 atomic64_set(&vgdev->fence_drv.last_fence_id, fence_id);
122 list_for_each_entry_safe(curr, tmp, &drv->fences, node) {
123 if (fence_id != curr->fence_id)
124 continue;
125
126 signaled = curr;
127
128 /*
129 * Signal any fences with a strictly smaller sequence number
130 * than the current signaled fence.
131 */
132 list_for_each_entry_safe(curr, tmp, &drv->fences, node) {
133 /* dma-fence contexts must match */
134 if (signaled->f.context != curr->f.context)
135 continue;
136
137 if (!dma_fence_is_later(&signaled->f, &curr->f))
138 continue;
139
140 dma_fence_signal_locked(&curr->f);
141 list_del(&curr->node);
142 dma_fence_put(&curr->f);
143 }
144
145 dma_fence_signal_locked(&signaled->f);
146 list_del(&signaled->node);
147 dma_fence_put(&signaled->f);
148 break;
149 }
150 spin_unlock_irqrestore(&drv->lock, irq_flags);
151}