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1/*2 * Copyright 2014 Canonical3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial portions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR20 * OTHER DEALINGS IN THE SOFTWARE.21 *22 * Authors: Andreas Pokorny23 */24 25#include <drm/drm_prime.h>26#include <linux/virtio_dma_buf.h>27 28#include "virtgpu_drv.h"29 30static int virtgpu_virtio_get_uuid(struct dma_buf *buf,31 uuid_t *uuid)32{33 struct drm_gem_object *obj = buf->priv;34 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);35 struct virtio_gpu_device *vgdev = obj->dev->dev_private;36 37 wait_event(vgdev->resp_wq, bo->uuid_state != STATE_INITIALIZING);38 if (bo->uuid_state != STATE_OK)39 return -ENODEV;40 41 uuid_copy(uuid, &bo->uuid);42 43 return 0;44}45 46static struct sg_table *47virtgpu_gem_map_dma_buf(struct dma_buf_attachment *attach,48 enum dma_data_direction dir)49{50 struct drm_gem_object *obj = attach->dmabuf->priv;51 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);52 53 if (virtio_gpu_is_vram(bo))54 return virtio_gpu_vram_map_dma_buf(bo, attach->dev, dir);55 56 return drm_gem_map_dma_buf(attach, dir);57}58 59static void virtgpu_gem_unmap_dma_buf(struct dma_buf_attachment *attach,60 struct sg_table *sgt,61 enum dma_data_direction dir)62{63 struct drm_gem_object *obj = attach->dmabuf->priv;64 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);65 66 if (virtio_gpu_is_vram(bo)) {67 virtio_gpu_vram_unmap_dma_buf(attach->dev, sgt, dir);68 return;69 }70 71 drm_gem_unmap_dma_buf(attach, sgt, dir);72}73 74static const struct virtio_dma_buf_ops virtgpu_dmabuf_ops = {75 .ops = {76 .cache_sgt_mapping = true,77 .attach = virtio_dma_buf_attach,78 .detach = drm_gem_map_detach,79 .map_dma_buf = virtgpu_gem_map_dma_buf,80 .unmap_dma_buf = virtgpu_gem_unmap_dma_buf,81 .release = drm_gem_dmabuf_release,82 .mmap = drm_gem_dmabuf_mmap,83 .vmap = drm_gem_dmabuf_vmap,84 .vunmap = drm_gem_dmabuf_vunmap,85 },86 .device_attach = drm_gem_map_attach,87 .get_uuid = virtgpu_virtio_get_uuid,88};89 90int virtio_gpu_resource_assign_uuid(struct virtio_gpu_device *vgdev,91 struct virtio_gpu_object *bo)92{93 struct virtio_gpu_object_array *objs;94 95 objs = virtio_gpu_array_alloc(1);96 if (!objs)97 return -ENOMEM;98 99 virtio_gpu_array_add_obj(objs, &bo->base.base);100 101 return virtio_gpu_cmd_resource_assign_uuid(vgdev, objs);102}103 104struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj,105 int flags)106{107 struct dma_buf *buf;108 struct drm_device *dev = obj->dev;109 struct virtio_gpu_device *vgdev = dev->dev_private;110 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);111 int ret = 0;112 bool blob = bo->host3d_blob || bo->guest_blob;113 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);114 115 if (!blob) {116 if (vgdev->has_resource_assign_uuid) {117 ret = virtio_gpu_resource_assign_uuid(vgdev, bo);118 if (ret)119 return ERR_PTR(ret);120 121 virtio_gpu_notify(vgdev);122 } else {123 bo->uuid_state = STATE_ERR;124 }125 } else if (!(bo->blob_flags & VIRTGPU_BLOB_FLAG_USE_CROSS_DEVICE)) {126 bo->uuid_state = STATE_ERR;127 }128 129 exp_info.ops = &virtgpu_dmabuf_ops.ops;130 exp_info.size = obj->size;131 exp_info.flags = flags;132 exp_info.priv = obj;133 exp_info.resv = obj->resv;134 135 buf = virtio_dma_buf_export(&exp_info);136 if (IS_ERR(buf))137 return buf;138 139 drm_dev_get(dev);140 drm_gem_object_get(obj);141 142 return buf;143}144 145struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,146 struct dma_buf *buf)147{148 struct drm_gem_object *obj;149 150 if (buf->ops == &virtgpu_dmabuf_ops.ops) {151 obj = buf->priv;152 if (obj->dev == dev) {153 /*154 * Importing dmabuf exported from our own gem increases155 * refcount on gem itself instead of f_count of dmabuf.156 */157 drm_gem_object_get(obj);158 return obj;159 }160 }161 162 return drm_gem_prime_import(dev, buf);163}164 165struct drm_gem_object *virtgpu_gem_prime_import_sg_table(166 struct drm_device *dev, struct dma_buf_attachment *attach,167 struct sg_table *table)168{169 return ERR_PTR(-ENODEV);170}171