diff options
Diffstat (limited to 'drivers/gpu/drm/virtio/virtgpu_prime.c')
| -rw-r--r-- | drivers/gpu/drm/virtio/virtgpu_prime.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c b/drivers/gpu/drm/virtio/virtgpu_prime.c new file mode 100644 index 000000000..44425f20d --- /dev/null +++ b/drivers/gpu/drm/virtio/virtgpu_prime.c @@ -0,0 +1,170 @@ +/* + * Copyright 2014 Canonical + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: Andreas Pokorny + */ + +#include <drm/drm_prime.h> +#include <linux/virtio_dma_buf.h> + +#include "virtgpu_drv.h" + +static int virtgpu_virtio_get_uuid(struct dma_buf *buf, + uuid_t *uuid) +{ + struct drm_gem_object *obj = buf->priv; + struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); + struct virtio_gpu_device *vgdev = obj->dev->dev_private; + + wait_event(vgdev->resp_wq, bo->uuid_state != STATE_INITIALIZING); + if (bo->uuid_state != STATE_OK) + return -ENODEV; + + uuid_copy(uuid, &bo->uuid); + + return 0; +} + +static struct sg_table * +virtgpu_gem_map_dma_buf(struct dma_buf_attachment *attach, + enum dma_data_direction dir) +{ + struct drm_gem_object *obj = attach->dmabuf->priv; + struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); + + if (virtio_gpu_is_vram(bo)) + return virtio_gpu_vram_map_dma_buf(bo, attach->dev, dir); + + return drm_gem_map_dma_buf(attach, dir); +} + +static void virtgpu_gem_unmap_dma_buf(struct dma_buf_attachment *attach, + struct sg_table *sgt, + enum dma_data_direction dir) +{ + struct drm_gem_object *obj = attach->dmabuf->priv; + struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); + + if (virtio_gpu_is_vram(bo)) { + virtio_gpu_vram_unmap_dma_buf(attach->dev, sgt, dir); + return; + } + + drm_gem_unmap_dma_buf(attach, sgt, dir); +} + +static const struct virtio_dma_buf_ops virtgpu_dmabuf_ops = { + .ops = { + .cache_sgt_mapping = true, + .attach = virtio_dma_buf_attach, + .detach = drm_gem_map_detach, + .map_dma_buf = virtgpu_gem_map_dma_buf, + .unmap_dma_buf = virtgpu_gem_unmap_dma_buf, + .release = drm_gem_dmabuf_release, + .mmap = drm_gem_dmabuf_mmap, + .vmap = drm_gem_dmabuf_vmap, + .vunmap = drm_gem_dmabuf_vunmap, + }, + .device_attach = drm_gem_map_attach, + .get_uuid = virtgpu_virtio_get_uuid, +}; + +int virtio_gpu_resource_assign_uuid(struct virtio_gpu_device *vgdev, + struct virtio_gpu_object *bo) +{ + struct virtio_gpu_object_array *objs; + + objs = virtio_gpu_array_alloc(1); + if (!objs) + return -ENOMEM; + + virtio_gpu_array_add_obj(objs, &bo->base.base); + + return virtio_gpu_cmd_resource_assign_uuid(vgdev, objs); +} + +struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj, + int flags) +{ + struct dma_buf *buf; + struct drm_device *dev = obj->dev; + struct virtio_gpu_device *vgdev = dev->dev_private; + struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); + int ret = 0; + bool blob = bo->host3d_blob || bo->guest_blob; + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + + if (!blob) { + if (vgdev->has_resource_assign_uuid) { + ret = virtio_gpu_resource_assign_uuid(vgdev, bo); + if (ret) + return ERR_PTR(ret); + + virtio_gpu_notify(vgdev); + } else { + bo->uuid_state = STATE_ERR; + } + } else if (!(bo->blob_flags & VIRTGPU_BLOB_FLAG_USE_CROSS_DEVICE)) { + bo->uuid_state = STATE_ERR; + } + + exp_info.ops = &virtgpu_dmabuf_ops.ops; + exp_info.size = obj->size; + exp_info.flags = flags; + exp_info.priv = obj; + exp_info.resv = obj->resv; + + buf = virtio_dma_buf_export(&exp_info); + if (IS_ERR(buf)) + return buf; + + drm_dev_get(dev); + drm_gem_object_get(obj); + + return buf; +} + +struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev, + struct dma_buf *buf) +{ + struct drm_gem_object *obj; + + if (buf->ops == &virtgpu_dmabuf_ops.ops) { + obj = buf->priv; + if (obj->dev == dev) { + /* + * Importing dmabuf exported from our own gem increases + * refcount on gem itself instead of f_count of dmabuf. + */ + drm_gem_object_get(obj); + return obj; + } + } + + return drm_gem_prime_import(dev, buf); +} + +struct drm_gem_object *virtgpu_gem_prime_import_sg_table( + struct drm_device *dev, struct dma_buf_attachment *attach, + struct sg_table *table) +{ + return ERR_PTR(-ENODEV); +} |