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 fence *f) 30 { 31 return "virtio_gpu"; 32 } 33 34 static const char *virtio_get_timeline_name(struct fence *f) 35 { 36 return "controlq"; 37 } 38 39 static bool virtio_enable_signaling(struct fence *f) 40 { 41 return true; 42 } 43 44 static bool virtio_signaled(struct 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 53 static void virtio_fence_value_str(struct 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 60 static void virtio_timeline_value_str(struct fence *f, char *str, int size) 61 { 62 struct virtio_gpu_fence *fence = to_virtio_fence(f); 63 64 snprintf(str, size, "%lu", atomic64_read(&fence->drv->last_seq)); 65 } 66 67 static const struct 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 = fence_default_wait, 73 .fence_value_str = virtio_fence_value_str, 74 .timeline_value_str = virtio_timeline_value_str, 75 }; 76 77 int 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_KERNEL); 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 fence_init(&(*fence)->f, &virtio_fence_ops, &drv->lock, 92 0, (*fence)->seq); 93 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 } 101 102 void 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 fence_signal_locked(&fence->f); 115 list_del(&fence->node); 116 fence_put(&fence->f); 117 } 118 spin_unlock_irqrestore(&drv->lock, irq_flags); 119 } 120