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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_fence(x) \
31 container_of(x, struct virtio_gpu_fence, f)
32
33static const char *virtio_get_driver_name(struct dma_fence *f)
34{
35 return "virtio_gpu";
36}
37
38static const char *virtio_get_timeline_name(struct dma_fence *f)
39{
40 return "controlq";
41}
42
43static bool virtio_fence_signaled(struct dma_fence *f)
44{
45 struct virtio_gpu_fence *fence = to_virtio_fence(f);
46
47 if (WARN_ON_ONCE(fence->f.seqno == 0))
48 /* leaked fence outside driver before completing
49 * initialization with virtio_gpu_fence_emit */
50 return false;
51 if (atomic64_read(&fence->drv->last_seq) >= fence->f.seqno)
52 return true;
53 return false;
54}
55
56static void virtio_fence_value_str(struct dma_fence *f, char *str, int size)
57{
58 snprintf(str, size, "%llu", f->seqno);
59}
60
61static void virtio_timeline_value_str(struct dma_fence *f, char *str, int size)
62{
63 struct virtio_gpu_fence *fence = to_virtio_fence(f);
64
65 snprintf(str, size, "%llu", (u64)atomic64_read(&fence->drv->last_seq));
66}
67
68static const struct dma_fence_ops virtio_fence_ops = {
69 .get_driver_name = virtio_get_driver_name,
70 .get_timeline_name = virtio_get_timeline_name,
71 .signaled = virtio_fence_signaled,
72 .fence_value_str = virtio_fence_value_str,
73 .timeline_value_str = virtio_timeline_value_str,
74};
75
76struct virtio_gpu_fence *virtio_gpu_fence_alloc(struct virtio_gpu_device *vgdev)
77{
78 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
79 struct virtio_gpu_fence *fence = kzalloc(sizeof(struct virtio_gpu_fence),
80 GFP_KERNEL);
81 if (!fence)
82 return fence;
83
84 fence->drv = drv;
85
86 /* This only partially initializes the fence because the seqno is
87 * unknown yet. The fence must not be used outside of the driver
88 * until virtio_gpu_fence_emit is called.
89 */
90 dma_fence_init(&fence->f, &virtio_fence_ops, &drv->lock, drv->context, 0);
91
92 return fence;
93}
94
95void virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
96 struct virtio_gpu_ctrl_hdr *cmd_hdr,
97 struct virtio_gpu_fence *fence)
98{
99 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
100 unsigned long irq_flags;
101
102 spin_lock_irqsave(&drv->lock, irq_flags);
103 fence->f.seqno = ++drv->sync_seq;
104 dma_fence_get(&fence->f);
105 list_add_tail(&fence->node, &drv->fences);
106 spin_unlock_irqrestore(&drv->lock, irq_flags);
107
108 trace_dma_fence_emit(&fence->f);
109
110 cmd_hdr->flags |= cpu_to_le32(VIRTIO_GPU_FLAG_FENCE);
111 cmd_hdr->fence_id = cpu_to_le64(fence->f.seqno);
112}
113
114void virtio_gpu_fence_event_process(struct virtio_gpu_device *vgdev,
115 u64 last_seq)
116{
117 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
118 struct virtio_gpu_fence *fence, *tmp;
119 unsigned long irq_flags;
120
121 spin_lock_irqsave(&drv->lock, irq_flags);
122 atomic64_set(&vgdev->fence_drv.last_seq, last_seq);
123 list_for_each_entry_safe(fence, tmp, &drv->fences, node) {
124 if (last_seq < fence->f.seqno)
125 continue;
126 dma_fence_signal_locked(&fence->f);
127 list_del(&fence->node);
128 dma_fence_put(&fence->f);
129 }
130 spin_unlock_irqrestore(&drv->lock, irq_flags);
131}