drivers/gpu/drm/virtio/virtgpu_prime.c

   1 /*
   2  * Copyright 2014 Canonical
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * 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 OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Andreas Pokorny
  23  */
  24
  25 #include <drm/drm_prime.h>
  26 #include <linux/virtio_dma_buf.h>
  27
  28 #include "virtgpu_drv.h"
  29
  30 static 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 != UUID_INITIALIZING);
  38         if (bo->uuid_state != UUID_INITIALIZED)
  39                 return -ENODEV;
  40
  41         uuid_copy(uuid, &bo->uuid);
  42
  43         return 0;
  44 }
  45
  46 const struct virtio_dma_buf_ops virtgpu_dmabuf_ops =  {
  47         .ops = {
  48                 .cache_sgt_mapping = true,
  49                 .attach = virtio_dma_buf_attach,
  50                 .detach = drm_gem_map_detach,
  51                 .map_dma_buf = drm_gem_map_dma_buf,
  52                 .unmap_dma_buf = drm_gem_unmap_dma_buf,
  53                 .release = drm_gem_dmabuf_release,
  54                 .mmap = drm_gem_dmabuf_mmap,
  55                 .vmap = drm_gem_dmabuf_vmap,
  56                 .vunmap = drm_gem_dmabuf_vunmap,
  57         },
  58         .device_attach = drm_gem_map_attach,
  59         .get_uuid = virtgpu_virtio_get_uuid,
  60 };
  61
  62 struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj,
  63                                          int flags)
  64 {
  65         struct dma_buf *buf;
  66         struct drm_device *dev = obj->dev;
  67         struct virtio_gpu_device *vgdev = dev->dev_private;
  68         struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
  69         struct virtio_gpu_object_array *objs;
  70         int ret = 0;
  71         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
  72
  73         if (vgdev->has_resource_assign_uuid) {
  74                 objs = virtio_gpu_array_alloc(1);
  75                 if (!objs)
  76                         return ERR_PTR(-ENOMEM);
  77                 virtio_gpu_array_add_obj(objs, &bo->base.base);
  78
  79                 ret = virtio_gpu_cmd_resource_assign_uuid(vgdev, objs);
  80                 if (ret)
  81                         return ERR_PTR(ret);
  82                 virtio_gpu_notify(vgdev);
  83         } else {
  84                 bo->uuid_state = UUID_INITIALIZATION_FAILED;
  85         }
  86
  87         exp_info.ops = &virtgpu_dmabuf_ops.ops;
  88         exp_info.size = obj->size;
  89         exp_info.flags = flags;
  90         exp_info.priv = obj;
  91         exp_info.resv = obj->resv;
  92
  93         buf = virtio_dma_buf_export(&exp_info);
  94         if (IS_ERR(buf))
  95                 return buf;
  96
  97         drm_dev_get(dev);
  98         drm_gem_object_get(obj);
  99
 100         return buf;
 101 }
 102
 103 struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
 104                                                 struct dma_buf *buf)
 105 {
 106         struct drm_gem_object *obj;
 107
 108         if (buf->ops == &virtgpu_dmabuf_ops.ops) {
 109                 obj = buf->priv;
 110                 if (obj->dev == dev) {
 111                         /*
 112                          * Importing dmabuf exported from our own gem increases
 113                          * refcount on gem itself instead of f_count of dmabuf.
 114                          */
 115                         drm_gem_object_get(obj);
 116                         return obj;
 117                 }
 118         }
 119
 120         return drm_gem_prime_import(dev, buf);
 121 }
 122
 123 struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
 124         struct drm_device *dev, struct dma_buf_attachment *attach,
 125         struct sg_table *table)
 126 {
 127         return ERR_PTR(-ENODEV);
 128 }