drm/virtio/virtgpu_prime.c

0001 /*
0002  * Copyright 2014 Canonical
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  *
0022  * Authors: Andreas Pokorny
0023  */
0024
0025 #include <drm/drm_prime.h>
0026 #include <linux/virtio_dma_buf.h>
0027
0028 #include "virtgpu_drv.h"
0029
0030 static int virtgpu_virtio_get_uuid(struct dma_buf *buf,
0031                    uuid_t *uuid)
0032 {
0033     struct drm_gem_object *obj = buf->priv;
0034     struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
0035     struct virtio_gpu_device *vgdev = obj->dev->dev_private;
0036
0037     wait_event(vgdev->resp_wq, bo->uuid_state != STATE_INITIALIZING);
0038     if (bo->uuid_state != STATE_OK)
0039         return -ENODEV;
0040
0041     uuid_copy(uuid, &bo->uuid);
0042
0043     return 0;
0044 }
0045
0046 static struct sg_table *
0047 virtgpu_gem_map_dma_buf(struct dma_buf_attachment *attach,
0048             enum dma_data_direction dir)
0049 {
0050     struct drm_gem_object *obj = attach->dmabuf->priv;
0051     struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
0052
0053     if (virtio_gpu_is_vram(bo))
0054         return virtio_gpu_vram_map_dma_buf(bo, attach->dev, dir);
0055
0056     return drm_gem_map_dma_buf(attach, dir);
0057 }
0058
0059 static void virtgpu_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
0060                       struct sg_table *sgt,
0061                       enum dma_data_direction dir)
0062 {
0063     struct drm_gem_object *obj = attach->dmabuf->priv;
0064     struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
0065
0066     if (virtio_gpu_is_vram(bo)) {
0067         virtio_gpu_vram_unmap_dma_buf(attach->dev, sgt, dir);
0068         return;
0069     }
0070
0071     drm_gem_unmap_dma_buf(attach, sgt, dir);
0072 }
0073
0074 static const struct virtio_dma_buf_ops virtgpu_dmabuf_ops =  {
0075     .ops = {
0076         .cache_sgt_mapping = true,
0077         .attach = virtio_dma_buf_attach,
0078         .detach = drm_gem_map_detach,
0079         .map_dma_buf = virtgpu_gem_map_dma_buf,
0080         .unmap_dma_buf = virtgpu_gem_unmap_dma_buf,
0081         .release = drm_gem_dmabuf_release,
0082         .mmap = drm_gem_dmabuf_mmap,
0083         .vmap = drm_gem_dmabuf_vmap,
0084         .vunmap = drm_gem_dmabuf_vunmap,
0085     },
0086     .device_attach = drm_gem_map_attach,
0087     .get_uuid = virtgpu_virtio_get_uuid,
0088 };
0089
0090 int virtio_gpu_resource_assign_uuid(struct virtio_gpu_device *vgdev,
0091                     struct virtio_gpu_object *bo)
0092 {
0093     struct virtio_gpu_object_array *objs;
0094
0095     objs = virtio_gpu_array_alloc(1);
0096     if (!objs)
0097         return -ENOMEM;
0098
0099     virtio_gpu_array_add_obj(objs, &bo->base.base);
0100
0101     return virtio_gpu_cmd_resource_assign_uuid(vgdev, objs);
0102 }
0103
0104 struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj,
0105                      int flags)
0106 {
0107     struct dma_buf *buf;
0108     struct drm_device *dev = obj->dev;
0109     struct virtio_gpu_device *vgdev = dev->dev_private;
0110     struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
0111     int ret = 0;
0112     bool blob = bo->host3d_blob || bo->guest_blob;
0113     DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
0114
0115     if (!blob) {
0116         if (vgdev->has_resource_assign_uuid) {
0117             ret = virtio_gpu_resource_assign_uuid(vgdev, bo);
0118             if (ret)
0119                 return ERR_PTR(ret);
0120
0121             virtio_gpu_notify(vgdev);
0122         } else {
0123             bo->uuid_state = STATE_ERR;
0124         }
0125     } else if (!(bo->blob_flags & VIRTGPU_BLOB_FLAG_USE_CROSS_DEVICE)) {
0126         bo->uuid_state = STATE_ERR;
0127     }
0128
0129     exp_info.ops = &virtgpu_dmabuf_ops.ops;
0130     exp_info.size = obj->size;
0131     exp_info.flags = flags;
0132     exp_info.priv = obj;
0133     exp_info.resv = obj->resv;
0134
0135     buf = virtio_dma_buf_export(&exp_info);
0136     if (IS_ERR(buf))
0137         return buf;
0138
0139     drm_dev_get(dev);
0140     drm_gem_object_get(obj);
0141
0142     return buf;
0143 }
0144
0145 struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
0146                         struct dma_buf *buf)
0147 {
0148     struct drm_gem_object *obj;
0149
0150     if (buf->ops == &virtgpu_dmabuf_ops.ops) {
0151         obj = buf->priv;
0152         if (obj->dev == dev) {
0153             /*
0154              * Importing dmabuf exported from our own gem increases
0155              * refcount on gem itself instead of f_count of dmabuf.
0156              */
0157             drm_gem_object_get(obj);
0158             return obj;
0159         }
0160     }
0161
0162     return drm_gem_prime_import(dev, buf);
0163 }
0164
0165 struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
0166     struct drm_device *dev, struct dma_buf_attachment *attach,
0167     struct sg_table *table)
0168 {
0169     return ERR_PTR(-ENODEV);
0170 }