EXPORT_SYMBOL_GPL(drm_gem_cma_describe);
#endif
-/* -----------------------------------------------------------------------------
- * DMA-BUF
- */
-
-struct drm_gem_cma_dmabuf_attachment {
- struct sg_table sgt;
- enum dma_data_direction dir;
-};
-
-static int drm_gem_cma_dmabuf_attach(struct dma_buf *dmabuf, struct device *dev,
- struct dma_buf_attachment *attach)
-{
- struct drm_gem_cma_dmabuf_attachment *cma_attach;
-
- cma_attach = kzalloc(sizeof(*cma_attach), GFP_KERNEL);
- if (!cma_attach)
- return -ENOMEM;
-
- cma_attach->dir = DMA_NONE;
- attach->priv = cma_attach;
-
- return 0;
-}
-
-static void drm_gem_cma_dmabuf_detach(struct dma_buf *dmabuf,
- struct dma_buf_attachment *attach)
-{
- struct drm_gem_cma_dmabuf_attachment *cma_attach = attach->priv;
- struct sg_table *sgt;
-
- if (cma_attach == NULL)
- return;
-
- sgt = &cma_attach->sgt;
-
- if (cma_attach->dir != DMA_NONE)
- dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents,
- cma_attach->dir);
-
- sg_free_table(sgt);
- kfree(cma_attach);
- attach->priv = NULL;
-}
-
-static struct sg_table *
-drm_gem_cma_dmabuf_map(struct dma_buf_attachment *attach,
- enum dma_data_direction dir)
-{
- struct drm_gem_cma_dmabuf_attachment *cma_attach = attach->priv;
- struct drm_gem_cma_object *cma_obj = attach->dmabuf->priv;
- struct drm_device *drm = cma_obj->base.dev;
- struct scatterlist *rd, *wr;
- struct sg_table *sgt;
- unsigned int i;
- int nents, ret;
-
- DRM_DEBUG_PRIME("\n");
-
- if (WARN_ON(dir == DMA_NONE))
- return ERR_PTR(-EINVAL);
-
- /* Return the cached mapping when possible. */
- if (cma_attach->dir == dir)
- return &cma_attach->sgt;
-
- /* Two mappings with different directions for the same attachment are
- * not allowed.
- */
- if (WARN_ON(cma_attach->dir != DMA_NONE))
- return ERR_PTR(-EBUSY);
-
- sgt = &cma_attach->sgt;
-
- ret = sg_alloc_table(sgt, cma_obj->sgt->orig_nents, GFP_KERNEL);
- if (ret) {
- DRM_ERROR("failed to alloc sgt.\n");
- return ERR_PTR(-ENOMEM);
- }
-
- mutex_lock(&drm->struct_mutex);
-
- rd = cma_obj->sgt->sgl;
- wr = sgt->sgl;
- for (i = 0; i < sgt->orig_nents; ++i) {
- sg_set_page(wr, sg_page(rd), rd->length, rd->offset);
- rd = sg_next(rd);
- wr = sg_next(wr);
- }
-
- nents = dma_map_sg(attach->dev, sgt->sgl, sgt->orig_nents, dir);
- if (!nents) {
- DRM_ERROR("failed to map sgl with iommu.\n");
- sg_free_table(sgt);
- sgt = ERR_PTR(-EIO);
- goto done;
- }
-
- cma_attach->dir = dir;
- attach->priv = cma_attach;
-
- DRM_DEBUG_PRIME("buffer size = %zu\n", cma_obj->base.size);
-
-done:
- mutex_unlock(&drm->struct_mutex);
- return sgt;
-}
-
-static void drm_gem_cma_dmabuf_unmap(struct dma_buf_attachment *attach,
- struct sg_table *sgt,
- enum dma_data_direction dir)
-{
- /* Nothing to do. */
-}
-
-static void drm_gem_cma_dmabuf_release(struct dma_buf *dmabuf)
-{
- struct drm_gem_cma_object *cma_obj = dmabuf->priv;
-
- DRM_DEBUG_PRIME("%s\n", __FILE__);
-
- /*
- * drm_gem_cma_dmabuf_release() call means that file object's
- * f_count is 0 and it calls drm_gem_object_handle_unreference()
- * to drop the references that these values had been increased
- * at drm_prime_handle_to_fd()
- */
- if (cma_obj->base.export_dma_buf == dmabuf) {
- cma_obj->base.export_dma_buf = NULL;
-
- /*
- * drop this gem object refcount to release allocated buffer
- * and resources.
- */
- drm_gem_object_unreference_unlocked(&cma_obj->base);
- }
-}
-
-static void *drm_gem_cma_dmabuf_kmap_atomic(struct dma_buf *dmabuf,
- unsigned long page_num)
-{
- /* TODO */
-
- return NULL;
-}
-
-static void drm_gem_cma_dmabuf_kunmap_atomic(struct dma_buf *dmabuf,
- unsigned long page_num, void *addr)
-{
- /* TODO */
-}
-
-static void *drm_gem_cma_dmabuf_kmap(struct dma_buf *dmabuf,
- unsigned long page_num)
-{
- /* TODO */
-
- return NULL;
-}
-
-static void drm_gem_cma_dmabuf_kunmap(struct dma_buf *dmabuf,
- unsigned long page_num, void *addr)
-{
- /* TODO */
-}
-
-static int drm_gem_cma_dmabuf_mmap(struct dma_buf *dmabuf,
- struct vm_area_struct *vma)
-{
- struct drm_gem_cma_object *cma_obj = dmabuf->priv;
- struct drm_gem_object *gem_obj = &cma_obj->base;
- struct drm_device *dev = gem_obj->dev;
- int ret;
-
- mutex_lock(&dev->struct_mutex);
- ret = drm_gem_mmap_obj(gem_obj, gem_obj->size, vma);
- mutex_unlock(&dev->struct_mutex);
- if (ret < 0)
- return ret;
-
- return drm_gem_cma_mmap_obj(cma_obj, vma);
-}
-
-static void *drm_gem_cma_dmabuf_vmap(struct dma_buf *dmabuf)
-{
- struct drm_gem_cma_object *cma_obj = dmabuf->priv;
-
- return cma_obj->vaddr;
-}
-
-static struct dma_buf_ops drm_gem_cma_dmabuf_ops = {
- .attach = drm_gem_cma_dmabuf_attach,
- .detach = drm_gem_cma_dmabuf_detach,
- .map_dma_buf = drm_gem_cma_dmabuf_map,
- .unmap_dma_buf = drm_gem_cma_dmabuf_unmap,
- .kmap = drm_gem_cma_dmabuf_kmap,
- .kmap_atomic = drm_gem_cma_dmabuf_kmap_atomic,
- .kunmap = drm_gem_cma_dmabuf_kunmap,
- .kunmap_atomic = drm_gem_cma_dmabuf_kunmap_atomic,
- .mmap = drm_gem_cma_dmabuf_mmap,
- .vmap = drm_gem_cma_dmabuf_vmap,
- .release = drm_gem_cma_dmabuf_release,
-};
-
-struct dma_buf *drm_gem_cma_dmabuf_export(struct drm_device *drm,
- struct drm_gem_object *obj, int flags)
-{
- struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
-
- return dma_buf_export(cma_obj, &drm_gem_cma_dmabuf_ops,
- cma_obj->base.size, flags);
-}
-EXPORT_SYMBOL_GPL(drm_gem_cma_dmabuf_export);
-
-struct drm_gem_object *drm_gem_cma_dmabuf_import(struct drm_device *drm,
- struct dma_buf *dma_buf)
-{
- struct drm_gem_cma_object *cma_obj;
- struct dma_buf_attachment *attach;
- struct sg_table *sgt;
- int ret;
-
- DRM_DEBUG_PRIME("%s\n", __FILE__);
-
- /* is this one of own objects? */
- if (dma_buf->ops == &drm_gem_cma_dmabuf_ops) {
- struct drm_gem_object *obj;
-
- cma_obj = dma_buf->priv;
- obj = &cma_obj->base;
-
- /* is it from our device? */
- if (obj->dev == drm) {
- /*
- * Importing dmabuf exported from out own gem increases
- * refcount on gem itself instead of f_count of dmabuf.
- */
- drm_gem_object_reference(obj);
- dma_buf_put(dma_buf);
- return obj;
- }
- }
-
- /* Create a CMA GEM buffer. */
- cma_obj = __drm_gem_cma_create(drm, dma_buf->size);
- if (IS_ERR(cma_obj))
- return ERR_PTR(PTR_ERR(cma_obj));
-
- /* Attach to the buffer and map it. Make sure the mapping is contiguous
- * on the device memory bus, as that's all we support.
- */
- attach = dma_buf_attach(dma_buf, drm->dev);
- if (IS_ERR(attach)) {
- ret = -EINVAL;
- goto error_gem_free;
- }
-
- sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
- if (IS_ERR_OR_NULL(sgt)) {
- ret = sgt ? PTR_ERR(sgt) : -ENOMEM;
- goto error_buf_detach;
- }
-
- if (sgt->nents != 1) {
- ret = -EINVAL;
- goto error_buf_unmap;
- }
-
- cma_obj->base.import_attach = attach;
- cma_obj->paddr = sg_dma_address(sgt->sgl);
- cma_obj->sgt = sgt;
-
- DRM_DEBUG_PRIME("dma_addr = 0x%x, size = %zu\n", cma_obj->paddr,
- dma_buf->size);
-
- return &cma_obj->base;
-
-error_buf_unmap:
- dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
-error_buf_detach:
- dma_buf_detach(dma_buf, attach);
-error_gem_free:
- drm_gem_cma_free_object(&cma_obj->base);
- return ERR_PTR(ret);
-}
-EXPORT_SYMBOL_GPL(drm_gem_cma_dmabuf_import);
-
/* low-level interface prime helpers */
struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj)
{
projects / platform / kernel / linux-stable.git / commitdiff