Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
30static const char *virtio_get_driver_name(struct dma_fence *f)
31{
32 return "virtio_gpu";
33}
34
35static const char *virtio_get_timeline_name(struct dma_fence *f)
36{
37 return "controlq";
38}
39
40bool virtio_fence_signaled(struct dma_fence *f)
41{
42 struct virtio_gpu_fence *fence = to_virtio_fence(f);
43
44 if (WARN_ON_ONCE(fence->f.seqno == 0))
45 /* leaked fence outside driver before completing
46 * initialization with virtio_gpu_fence_emit */
47 return false;
48 if (atomic64_read(&fence->drv->last_seq) >= fence->f.seqno)
49 return true;
50 return false;
51}
52
53static void virtio_fence_value_str(struct dma_fence *f, char *str, int size)
54{
55 snprintf(str, size, "%llu", f->seqno);
56}
57
58static void virtio_timeline_value_str(struct dma_fence *f, char *str, int size)
59{
60 struct virtio_gpu_fence *fence = to_virtio_fence(f);
61
62 snprintf(str, size, "%llu", (u64)atomic64_read(&fence->drv->last_seq));
63}
64
65static const struct dma_fence_ops virtio_fence_ops = {
66 .get_driver_name = virtio_get_driver_name,
67 .get_timeline_name = virtio_get_timeline_name,
68 .signaled = virtio_fence_signaled,
69 .fence_value_str = virtio_fence_value_str,
70 .timeline_value_str = virtio_timeline_value_str,
71};
72
73struct virtio_gpu_fence *virtio_gpu_fence_alloc(struct virtio_gpu_device *vgdev)
74{
75 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
76 struct virtio_gpu_fence *fence = kzalloc(sizeof(struct virtio_gpu_fence),
77 GFP_KERNEL);
78 if (!fence)
79 return fence;
80
81 fence->drv = drv;
82
83 /* This only partially initializes the fence because the seqno is
84 * unknown yet. The fence must not be used outside of the driver
85 * until virtio_gpu_fence_emit is called.
86 */
87 dma_fence_init(&fence->f, &virtio_fence_ops, &drv->lock, drv->context, 0);
88
89 return fence;
90}
91
92void virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
93 struct virtio_gpu_ctrl_hdr *cmd_hdr,
94 struct virtio_gpu_fence *fence)
95{
96 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
97 unsigned long irq_flags;
98
99 spin_lock_irqsave(&drv->lock, irq_flags);
100 fence->f.seqno = ++drv->sync_seq;
101 dma_fence_get(&fence->f);
102 list_add_tail(&fence->node, &drv->fences);
103 spin_unlock_irqrestore(&drv->lock, irq_flags);
104
105 trace_dma_fence_emit(&fence->f);
106
107 cmd_hdr->flags |= cpu_to_le32(VIRTIO_GPU_FLAG_FENCE);
108 cmd_hdr->fence_id = cpu_to_le64(fence->f.seqno);
109}
110
111void virtio_gpu_fence_event_process(struct virtio_gpu_device *vgdev,
112 u64 last_seq)
113{
114 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
115 struct virtio_gpu_fence *fence, *tmp;
116 unsigned long irq_flags;
117
118 spin_lock_irqsave(&drv->lock, irq_flags);
119 atomic64_set(&vgdev->fence_drv.last_seq, last_seq);
120 list_for_each_entry_safe(fence, tmp, &drv->fences, node) {
121 if (last_seq < fence->f.seqno)
122 continue;
123 dma_fence_signal_locked(&fence->f);
124 list_del(&fence->node);
125 dma_fence_put(&fence->f);
126 }
127 spin_unlock_irqrestore(&drv->lock, irq_flags);
128}