| /* |
| * Copyright (C) 2015 Red Hat, Inc. |
| * All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining |
| * a copy of this software and associated documentation files (the |
| * "Software"), to deal in the Software without restriction, including |
| * without limitation the rights to use, copy, modify, merge, publish, |
| * distribute, sublicense, and/or sell copies of the Software, and to |
| * permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the |
| * next paragraph) shall be included in all copies or substantial |
| * portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE |
| * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include <trace/events/dma_fence.h> |
| |
| #include "virtgpu_drv.h" |
| |
| #define to_virtio_fence(x) \ |
| container_of(x, struct virtio_gpu_fence, f) |
| |
| static const char *virtio_get_driver_name(struct dma_fence *f) |
| { |
| return "virtio_gpu"; |
| } |
| |
| static const char *virtio_get_timeline_name(struct dma_fence *f) |
| { |
| return "controlq"; |
| } |
| |
| static bool virtio_fence_signaled(struct dma_fence *f) |
| { |
| struct virtio_gpu_fence *fence = to_virtio_fence(f); |
| |
| if (WARN_ON_ONCE(fence->f.seqno == 0)) |
| /* leaked fence outside driver before completing |
| * initialization with virtio_gpu_fence_emit */ |
| return false; |
| if (atomic64_read(&fence->drv->last_seq) >= fence->f.seqno) |
| return true; |
| return false; |
| } |
| |
| static void virtio_fence_value_str(struct dma_fence *f, char *str, int size) |
| { |
| snprintf(str, size, "%llu", f->seqno); |
| } |
| |
| static void virtio_timeline_value_str(struct dma_fence *f, char *str, int size) |
| { |
| struct virtio_gpu_fence *fence = to_virtio_fence(f); |
| |
| snprintf(str, size, "%llu", (u64)atomic64_read(&fence->drv->last_seq)); |
| } |
| |
| static const struct dma_fence_ops virtio_fence_ops = { |
| .get_driver_name = virtio_get_driver_name, |
| .get_timeline_name = virtio_get_timeline_name, |
| .signaled = virtio_fence_signaled, |
| .fence_value_str = virtio_fence_value_str, |
| .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_KERNEL); |
| if (!fence) |
| return fence; |
| |
| fence->drv = drv; |
| |
| /* This only partially initializes the fence because the seqno is |
| * unknown yet. The fence must not be used outside of the driver |
| * until virtio_gpu_fence_emit is called. |
| */ |
| dma_fence_init(&fence->f, &virtio_fence_ops, &drv->lock, drv->context, 0); |
| |
| return fence; |
| } |
| |
| void virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev, |
| struct virtio_gpu_ctrl_hdr *cmd_hdr, |
| struct virtio_gpu_fence *fence) |
| { |
| struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv; |
| unsigned long irq_flags; |
| |
| spin_lock_irqsave(&drv->lock, irq_flags); |
| fence->f.seqno = ++drv->sync_seq; |
| dma_fence_get(&fence->f); |
| list_add_tail(&fence->node, &drv->fences); |
| spin_unlock_irqrestore(&drv->lock, irq_flags); |
| |
| 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); |
| } |
| |
| void virtio_gpu_fence_event_process(struct virtio_gpu_device *vgdev, |
| u64 last_seq) |
| { |
| struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv; |
| struct virtio_gpu_fence *fence, *tmp; |
| unsigned long irq_flags; |
| |
| spin_lock_irqsave(&drv->lock, irq_flags); |
| atomic64_set(&vgdev->fence_drv.last_seq, last_seq); |
| list_for_each_entry_safe(fence, tmp, &drv->fences, node) { |
| if (last_seq < fence->f.seqno) |
| continue; |
| dma_fence_signal_locked(&fence->f); |
| list_del(&fence->node); |
| dma_fence_put(&fence->f); |
| } |
| spin_unlock_irqrestore(&drv->lock, irq_flags); |
| } |