drivers/gpu/drm/virtio/virtgpu_fence.c

   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 <drm/drmP.h>
  27 #include "virtgpu_drv.h"
  28
  29 static const char *virtio_get_driver_name(struct dma_fence *f)
  30 {
  31         return "virtio_gpu";
  32 }
  33
  34 static const char *virtio_get_timeline_name(struct dma_fence *f)
  35 {
  36         return "controlq";
  37 }
  38
  39 static bool virtio_signaled(struct dma_fence *f)
  40 {
  41         struct virtio_gpu_fence *fence = to_virtio_fence(f);
  42
  43         if (atomic64_read(&fence->drv->last_seq) >= fence->seq)
  44                 return true;
  45         return false;
  46 }
  47
  48 static void virtio_fence_value_str(struct dma_fence *f, char *str, int size)
  49 {
  50         struct virtio_gpu_fence *fence = to_virtio_fence(f);
  51
  52         snprintf(str, size, "%llu", fence->seq);
  53 }
  54
  55 static void virtio_timeline_value_str(struct dma_fence *f, char *str, int size)
  56 {
  57         struct virtio_gpu_fence *fence = to_virtio_fence(f);
  58
  59         snprintf(str, size, "%llu", (u64)atomic64_read(&fence->drv->last_seq));
  60 }
  61
  62 static const struct dma_fence_ops virtio_fence_ops = {
  63         .get_driver_name     = virtio_get_driver_name,
  64         .get_timeline_name   = virtio_get_timeline_name,
  65         .signaled            = virtio_signaled,
  66         .fence_value_str     = virtio_fence_value_str,
  67         .timeline_value_str  = virtio_timeline_value_str,
  68 };
  69
  70 struct virtio_gpu_fence *virtio_gpu_fence_alloc(struct virtio_gpu_device *vgdev)
  71 {
  72         struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
  73         struct virtio_gpu_fence *fence = kzalloc(sizeof(struct virtio_gpu_fence),
  74                                                         GFP_ATOMIC);
  75         if (!fence)
  76                 return fence;
  77
  78         fence->drv = drv;
  79         dma_fence_init(&fence->f, &virtio_fence_ops, &drv->lock, drv->context, 0);
  80
  81         return fence;
  82 }
  83
  84 void virtio_gpu_fence_cleanup(struct virtio_gpu_fence *fence)
  85 {
  86         if (!fence)
  87                 return;
  88
  89         dma_fence_put(&fence->f);
  90 }
  91
  92 int 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->seq = ++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         cmd_hdr->flags |= cpu_to_le32(VIRTIO_GPU_FLAG_FENCE);
 106         cmd_hdr->fence_id = cpu_to_le64(fence->seq);
 107         return 0;
 108 }
 109
 110 void virtio_gpu_fence_event_process(struct virtio_gpu_device *vgdev,
 111                                     u64 last_seq)
 112 {
 113         struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
 114         struct virtio_gpu_fence *fence, *tmp;
 115         unsigned long irq_flags;
 116
 117         spin_lock_irqsave(&drv->lock, irq_flags);
 118         atomic64_set(&vgdev->fence_drv.last_seq, last_seq);
 119         list_for_each_entry_safe(fence, tmp, &drv->fences, node) {
 120                 if (last_seq < fence->seq)
 121                         continue;
 122                 dma_fence_signal_locked(&fence->f);
 123                 list_del(&fence->node);
 124                 dma_fence_put(&fence->f);
 125         }
 126         spin_unlock_irqrestore(&drv->lock, irq_flags);
 127 }