2 * Copyright (C) 2015 Red Hat, Inc.
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27 #include <trace/events/dma_fence.h>
28 #include "virtgpu_drv.h"
30 static const char *virtio_get_driver_name(struct dma_fence *f)
35 static const char *virtio_get_timeline_name(struct dma_fence *f)
40 bool virtio_fence_signaled(struct dma_fence *f)
42 struct virtio_gpu_fence *fence = to_virtio_fence(f);
44 if (atomic64_read(&fence->drv->last_seq) >= fence->f.seqno)
49 static void virtio_fence_value_str(struct dma_fence *f, char *str, int size)
51 snprintf(str, size, "%llu", f->seqno);
54 static void virtio_timeline_value_str(struct dma_fence *f, char *str, int size)
56 struct virtio_gpu_fence *fence = to_virtio_fence(f);
58 snprintf(str, size, "%llu", (u64)atomic64_read(&fence->drv->last_seq));
61 static const struct dma_fence_ops virtio_fence_ops = {
62 .get_driver_name = virtio_get_driver_name,
63 .get_timeline_name = virtio_get_timeline_name,
64 .signaled = virtio_fence_signaled,
65 .fence_value_str = virtio_fence_value_str,
66 .timeline_value_str = virtio_timeline_value_str,
69 struct virtio_gpu_fence *virtio_gpu_fence_alloc(struct virtio_gpu_device *vgdev)
71 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
72 struct virtio_gpu_fence *fence = kzalloc(sizeof(struct virtio_gpu_fence),
79 /* This only partially initializes the fence because the seqno is
80 * unknown yet. The fence must not be used outside of the driver
81 * until virtio_gpu_fence_emit is called.
83 dma_fence_init(&fence->f, &virtio_fence_ops, &drv->lock, drv->context, 0);
88 void virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
89 struct virtio_gpu_ctrl_hdr *cmd_hdr,
90 struct virtio_gpu_fence *fence)
92 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
93 unsigned long irq_flags;
95 spin_lock_irqsave(&drv->lock, irq_flags);
96 fence->f.seqno = ++drv->sync_seq;
97 dma_fence_get(&fence->f);
98 list_add_tail(&fence->node, &drv->fences);
99 spin_unlock_irqrestore(&drv->lock, irq_flags);
101 trace_dma_fence_emit(&fence->f);
103 cmd_hdr->flags |= cpu_to_le32(VIRTIO_GPU_FLAG_FENCE);
104 cmd_hdr->fence_id = cpu_to_le64(fence->f.seqno);
107 void virtio_gpu_fence_event_process(struct virtio_gpu_device *vgdev,
110 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
111 struct virtio_gpu_fence *fence, *tmp;
112 unsigned long irq_flags;
114 spin_lock_irqsave(&drv->lock, irq_flags);
115 atomic64_set(&vgdev->fence_drv.last_seq, last_seq);
116 list_for_each_entry_safe(fence, tmp, &drv->fences, node) {
117 if (last_seq < fence->f.seqno)
119 dma_fence_signal_locked(&fence->f);
120 list_del(&fence->node);
121 dma_fence_put(&fence->f);
123 spin_unlock_irqrestore(&drv->lock, irq_flags);