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drm/virtio: add virtio_gpu_alloc_fence()

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Refactor fence creation, add fences to relevant GPU
operations and add cursor helper functions.

This removes the potential for allocation failures from the
cmd_submit and atomic_commit paths.
Now a fence will be allocated first and only after that
will we proceed with the rest of the execution.

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: Robert Foss <robert.foss@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20181112165157.32765-2-robert.foss@collabora.com
Suggested-by: Rob Herring <robh@kernel.org>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Robert Foss
2018-11-12 17:51:54 +01:00
committed by Gerd Hoffmann
parent 2ae7f165c0
commit 9fdd90c0f4
5 changed files with 96 additions and 15 deletions
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29
drivers/gpu/drm/virtio/virtgpu_fence.c
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@@ -67,6 +67,28 @@ static const struct dma_fence_ops virtio_fence_ops = {
.timeline_value_str = virtio_timeline_value_str,
};
struct virtio_gpu_fence *virtio_gpu_fence_alloc(struct virtio_gpu_device *vgdev)
{
struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
struct virtio_gpu_fence *fence = kzalloc(sizeof(struct virtio_gpu_fence),
GFP_ATOMIC);
if (!fence)
return fence;
fence->drv = drv;
dma_fence_init(&fence->f, &virtio_fence_ops, &drv->lock, drv->context, 0);
return fence;
}
void virtio_gpu_fence_cleanup(struct virtio_gpu_fence *fence)
{
if (!fence)
return;
dma_fence_put(&fence->f);
}
int virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
struct virtio_gpu_ctrl_hdr *cmd_hdr,
struct virtio_gpu_fence **fence)
@@ -74,15 +96,8 @@ int virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
unsigned long irq_flags;
*fence = kmalloc(sizeof(struct virtio_gpu_fence), GFP_ATOMIC);
if ((*fence) == NULL)
return -ENOMEM;
spin_lock_irqsave(&drv->lock, irq_flags);
(*fence)->drv = drv;
(*fence)->seq = ++drv->sync_seq;
dma_fence_init(&(*fence)->f, &virtio_fence_ops, &drv->lock,
drv->context, (*fence)->seq);
dma_fence_get(&(*fence)->f);
list_add_tail(&(*fence)->node, &drv->fences);
spin_unlock_irqrestore(&drv->lock, irq_flags);