This an incremental refactor towards multiple dma-fence contexts in virtio-gpu. Since all fences are still allocated using &virtio_gpu_fence_driver.context, nothing should break and every processed fence will be signaled.
The overall idea is every 3D context can allocate a number of dma-fence contexts. Each dma-fence context refers to it's own timeline.
For example, consider the following case where virgl submits commands to the GPU (fence ids 1, 3) and does a metadata query with the CPU (fence id 5). In a different process, gfxstream submits commands to the GPU (fence ids 2, 4).
fence_id (&dma_fence.seqno) | 1 2 3 4 5 ----------------------------------|----------- fence_ctx 0 (virgl gpu) | 1 3 fence_ctx 1 (virgl metadata query)| 5 fence_ctx 2 (gfxstream gpu) | 2 4
With multiple fence contexts, we can wait for the metadata query to finish without waiting for the virgl gpu to finish. virgl gpu does not have to wait for gfxstream gpu. The fence id still is the monotonically increasing sequence number, but it's only revelant to the specific dma-fence context.
To fully enable this feature, we'll need to: - have each 3d context allocate a number of fence contexts. Not too hard with explicit context initialization on the horizon. - have guest userspace specify fence context when performing ioctls. - tag each fence emitted to the host with the fence context information. virtio_gpu_ctrl_hdr has padding + flags available, so that should be easy.
This change goes in the direction specified above, by: - looking up the virtgpu_fence given a fence_id - signalling all prior fences in a given context - signalling current fence
v2: fix grammar in comment v3: add r-b tags
Reviewed-by: Anthoine Bourgeois anthoine.bourgeois@gmail.com Signed-off-by: Gurchetan Singh gurchetansingh@chromium.org --- drivers/gpu/drm/virtio/virtgpu_drv.h | 1 + drivers/gpu/drm/virtio/virtgpu_fence.c | 39 ++++++++++++++++++++------ 2 files changed, 31 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h index 6a232553c99b..d9dbc4f258f3 100644 --- a/drivers/gpu/drm/virtio/virtgpu_drv.h +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h @@ -136,6 +136,7 @@ struct virtio_gpu_fence_driver {
struct virtio_gpu_fence { struct dma_fence f; + uint64_t fence_id; struct virtio_gpu_fence_driver *drv; struct list_head node; }; diff --git a/drivers/gpu/drm/virtio/virtgpu_fence.c b/drivers/gpu/drm/virtio/virtgpu_fence.c index b35fcd1d02d7..d28e25e8409b 100644 --- a/drivers/gpu/drm/virtio/virtgpu_fence.c +++ b/drivers/gpu/drm/virtio/virtgpu_fence.c @@ -51,7 +51,7 @@ static bool virtio_gpu_fence_signaled(struct dma_fence *f)
static void virtio_gpu_fence_value_str(struct dma_fence *f, char *str, int size) { - snprintf(str, size, "%llu", f->seqno); + snprintf(str, size, "[%llu, %llu]", f->context, f->seqno); }
static void virtio_gpu_timeline_value_str(struct dma_fence *f, char *str, @@ -99,7 +99,7 @@ void virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev, unsigned long irq_flags;
spin_lock_irqsave(&drv->lock, irq_flags); - fence->f.seqno = ++drv->current_fence_id; + fence->fence_id = fence->f.seqno = ++drv->current_fence_id; dma_fence_get(&fence->f); list_add_tail(&fence->node, &drv->fences); spin_unlock_irqrestore(&drv->lock, irq_flags); @@ -107,24 +107,45 @@ void virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev, trace_dma_fence_emit(&fence->f);
cmd_hdr->flags |= cpu_to_le32(VIRTIO_GPU_FLAG_FENCE); - cmd_hdr->fence_id = cpu_to_le64(fence->f.seqno); + cmd_hdr->fence_id = cpu_to_le64(fence->fence_id); }
void virtio_gpu_fence_event_process(struct virtio_gpu_device *vgdev, u64 fence_id) { struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv; - struct virtio_gpu_fence *fence, *tmp; + struct virtio_gpu_fence *signaled, *curr, *tmp; unsigned long irq_flags;
spin_lock_irqsave(&drv->lock, irq_flags); atomic64_set(&vgdev->fence_drv.last_fence_id, fence_id); - list_for_each_entry_safe(fence, tmp, &drv->fences, node) { - if (fence_id < fence->f.seqno) + list_for_each_entry_safe(curr, tmp, &drv->fences, node) { + if (fence_id != curr->fence_id) continue; - dma_fence_signal_locked(&fence->f); - list_del(&fence->node); - dma_fence_put(&fence->f); + + signaled = curr; + + /* + * Signal any fences with a strictly smaller sequence number + * than the current signaled fence. + */ + list_for_each_entry_safe(curr, tmp, &drv->fences, node) { + /* dma-fence contexts must match */ + if (signaled->f.context != curr->f.context) + continue; + + if (!dma_fence_is_later(&signaled->f, &curr->f)) + continue; + + dma_fence_signal_locked(&curr->f); + list_del(&curr->node); + dma_fence_put(&curr->f); + } + + dma_fence_signal_locked(&signaled->f); + list_del(&signaled->node); + dma_fence_put(&signaled->f); + break; } spin_unlock_irqrestore(&drv->lock, irq_flags); }