LXR linux/drivers/gpu/drm/virtio/virtgpu

   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
  29static const char *virtio_get_driver_name(struct dma_fence *f)
  30{
  31        return "virtio_gpu";
  32}
  33
  34static const char *virtio_get_timeline_name(struct dma_fence *f)
  35{
  36        return "controlq";
  37}
  38
  39static bool virtio_enable_signaling(struct dma_fence *f)
  40{
  41        return true;
  42}
  43
  44static bool virtio_signaled(struct dma_fence *f)
  45{
  46        struct virtio_gpu_fence *fence = to_virtio_fence(f);
  47
  48        if (atomic64_read(&fence->drv->last_seq) >= fence->seq)
  49                return true;
  50        return false;
  51}
  52
  53static void virtio_fence_value_str(struct dma_fence *f, char *str, int size)
  54{
  55        struct virtio_gpu_fence *fence = to_virtio_fence(f);
  56
  57        snprintf(str, size, "%llu", fence->seq);
  58}
  59
  60static void virtio_timeline_value_str(struct dma_fence *f, char *str, int size)
  61{
  62        struct virtio_gpu_fence *fence = to_virtio_fence(f);
  63
  64        snprintf(str, size, "%llu", (u64)atomic64_read(&fence->drv->last_seq));
  65}
  66
  67static const struct dma_fence_ops virtio_fence_ops = {
  68        .get_driver_name     = virtio_get_driver_name,
  69        .get_timeline_name   = virtio_get_timeline_name,
  70        .enable_signaling    = virtio_enable_signaling,
  71        .signaled            = virtio_signaled,
  72        .wait                = dma_fence_default_wait,
  73        .fence_value_str     = virtio_fence_value_str,
  74        .timeline_value_str  = virtio_timeline_value_str,
  75};
  76
  77int virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
  78                          struct virtio_gpu_ctrl_hdr *cmd_hdr,
  79                          struct virtio_gpu_fence **fence)
  80{
  81        struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
  82        unsigned long irq_flags;
  83
  84        *fence = kmalloc(sizeof(struct virtio_gpu_fence), GFP_ATOMIC);
  85        if ((*fence) == NULL)
  86                return -ENOMEM;
  87
  88        spin_lock_irqsave(&drv->lock, irq_flags);
  89        (*fence)->drv = drv;
  90        (*fence)->seq = ++drv->sync_seq;
  91        dma_fence_init(&(*fence)->f, &virtio_fence_ops, &drv->lock,
  92                       drv->context, (*fence)->seq);
  93        dma_fence_get(&(*fence)->f);
  94        list_add_tail(&(*fence)->node, &drv->fences);
  95        spin_unlock_irqrestore(&drv->lock, irq_flags);
  96
  97        cmd_hdr->flags |= cpu_to_le32(VIRTIO_GPU_FLAG_FENCE);
  98        cmd_hdr->fence_id = cpu_to_le64((*fence)->seq);
  99        return 0;
 100}
 101
 102void virtio_gpu_fence_event_process(struct virtio_gpu_device *vgdev,
 103                                    u64 last_seq)
 104{
 105        struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
 106        struct virtio_gpu_fence *fence, *tmp;
 107        unsigned long irq_flags;
 108
 109        spin_lock_irqsave(&drv->lock, irq_flags);
 110        atomic64_set(&vgdev->fence_drv.last_seq, last_seq);
 111        list_for_each_entry_safe(fence, tmp, &drv->fences, node) {
 112                if (last_seq < fence->seq)
 113                        continue;
 114                dma_fence_signal_locked(&fence->f);
 115                list_del(&fence->node);
 116                dma_fence_put(&fence->f);
 117        }
 118        spin_unlock_irqrestore(&drv->lock, irq_flags);
 119}
 120