drm/prime: Shuffle functions. (b283e92a) · Commits · 戴 / test

drivers/gpu/drm/drm_prime.c

+385 −385

Original line number	Diff line number	Diff line
		@@ -181,42 +181,6 @@ static int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpri
		return -ENOENT;
		}

		/**
		* drm_gem_map_attach - dma_buf attach implementation for GEM
		* @dma_buf: buffer to attach device to
		* @attach: buffer attachment data
		*
		* Calls &drm_driver.gem_prime_pin for device specific handling. This can be
		* used as the &dma_buf_ops.attach callback.
		*
		* Returns 0 on success, negative error code on failure.
		*/
		int drm_gem_map_attach(struct dma_buf *dma_buf,
		struct dma_buf_attachment *attach)
		{
		struct drm_gem_object *obj = dma_buf->priv;

		return drm_gem_pin(obj);
		}
		EXPORT_SYMBOL(drm_gem_map_attach);

		/**
		* drm_gem_map_detach - dma_buf detach implementation for GEM
		* @dma_buf: buffer to detach from
		* @attach: attachment to be detached
		*
		* Cleans up &dma_buf_attachment. This can be used as the &dma_buf_ops.detach
		* callback.
		*/
		void drm_gem_map_detach(struct dma_buf *dma_buf,
		struct dma_buf_attachment *attach)
		{
		struct drm_gem_object *obj = dma_buf->priv;

		drm_gem_unpin(obj);
		}
		EXPORT_SYMBOL(drm_gem_map_detach);

		void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv,
		struct dma_buf *dma_buf)
		{
		@@ -242,64 +206,18 @@ void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpr
		}
		}

		/**
		* drm_gem_map_dma_buf - map_dma_buf implementation for GEM
		* @attach: attachment whose scatterlist is to be returned
		* @dir: direction of DMA transfer
		*
		* Calls &drm_driver.gem_prime_get_sg_table and then maps the scatterlist. This
		* can be used as the &dma_buf_ops.map_dma_buf callback.
		*
		* Returns sg_table containing the scatterlist to be returned; returns ERR_PTR
		* on error. May return -EINTR if it is interrupted by a signal.
		*/

		struct sg_table drm_gem_map_dma_buf(struct dma_buf_attachment attach,
		enum dma_data_direction dir)
		void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv)
		{
		struct drm_gem_object *obj = attach->dmabuf->priv;
		struct sg_table *sgt;

		if (WARN_ON(dir == DMA_NONE))
		return ERR_PTR(-EINVAL);

		if (obj->funcs)
		sgt = obj->funcs->get_sg_table(obj);
		else
		sgt = obj->dev->driver->gem_prime_get_sg_table(obj);

		if (!dma_map_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
		DMA_ATTR_SKIP_CPU_SYNC)) {
		sg_free_table(sgt);
		kfree(sgt);
		sgt = ERR_PTR(-ENOMEM);
		}

		return sgt;
		mutex_init(&prime_fpriv->lock);
		prime_fpriv->dmabufs = RB_ROOT;
		prime_fpriv->handles = RB_ROOT;
		}
		EXPORT_SYMBOL(drm_gem_map_dma_buf);

		/**
		* drm_gem_unmap_dma_buf - unmap_dma_buf implementation for GEM
		* @attach: attachment to unmap buffer from
		* @sgt: scatterlist info of the buffer to unmap
		* @dir: direction of DMA transfer
		*
		* This can be used as the &dma_buf_ops.unmap_dma_buf callback.
		*/
		void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
		struct sg_table *sgt,
		enum dma_data_direction dir)
		void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv)
		{
		if (!sgt)
		return;

		dma_unmap_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
		DMA_ATTR_SKIP_CPU_SYNC);
		sg_free_table(sgt);
		kfree(sgt);
		/* by now drm_gem_release should've made sure the list is empty */
		WARN_ON(!RB_EMPTY_ROOT(&prime_fpriv->dmabufs));
		}
		EXPORT_SYMBOL(drm_gem_unmap_dma_buf);

		/**
		* drm_gem_dmabuf_export - dma_buf export implementation for GEM
		@@ -351,128 +269,101 @@ void drm_gem_dmabuf_release(struct dma_buf *dma_buf)
		EXPORT_SYMBOL(drm_gem_dmabuf_release);

		/**
		* drm_gem_dmabuf_vmap - dma_buf vmap implementation for GEM
		* @dma_buf: buffer to be mapped
		*
		* Sets up a kernel virtual mapping. This can be used as the &dma_buf_ops.vmap
		* callback.
		* drm_gem_prime_fd_to_handle - PRIME import function for GEM drivers
		* @dev: dev to export the buffer from
		* @file_priv: drm file-private structure
		* @prime_fd: fd id of the dma-buf which should be imported
		* @handle: pointer to storage for the handle of the imported buffer object
		*
		* Returns the kernel virtual address.
		* This is the PRIME import function which must be used mandatorily by GEM
		* drivers to ensure correct lifetime management of the underlying GEM object.
		* The actual importing of GEM object from the dma-buf is done through the
		* gem_import_export driver callback.
		*/
		void drm_gem_dmabuf_vmap(struct dma_buf dma_buf)
		int drm_gem_prime_fd_to_handle(struct drm_device *dev,
		struct drm_file *file_priv, int prime_fd,
		uint32_t *handle)
		{
		struct drm_gem_object *obj = dma_buf->priv;
		void *vaddr;
		struct dma_buf *dma_buf;
		struct drm_gem_object *obj;
		int ret;

		vaddr = drm_gem_vmap(obj);
		if (IS_ERR(vaddr))
		vaddr = NULL;
		dma_buf = dma_buf_get(prime_fd);
		if (IS_ERR(dma_buf))
		return PTR_ERR(dma_buf);

		return vaddr;
		}
		EXPORT_SYMBOL(drm_gem_dmabuf_vmap);
		mutex_lock(&file_priv->prime.lock);

		/**
		* drm_gem_dmabuf_vunmap - dma_buf vunmap implementation for GEM
		* @dma_buf: buffer to be unmapped
		* @vaddr: the virtual address of the buffer
		*
		* Releases a kernel virtual mapping. This can be used as the
		* &dma_buf_ops.vunmap callback.
		*/
		void drm_gem_dmabuf_vunmap(struct dma_buf dma_buf, void vaddr)
		{
		struct drm_gem_object *obj = dma_buf->priv;
		ret = drm_prime_lookup_buf_handle(&file_priv->prime,
		dma_buf, handle);
		if (ret == 0)
		goto out_put;

		drm_gem_vunmap(obj, vaddr);
		/* never seen this one, need to import */
		mutex_lock(&dev->object_name_lock);
		if (dev->driver->gem_prime_import)
		obj = dev->driver->gem_prime_import(dev, dma_buf);
		else
		obj = drm_gem_prime_import(dev, dma_buf);
		if (IS_ERR(obj)) {
		ret = PTR_ERR(obj);
		goto out_unlock;
		}
		EXPORT_SYMBOL(drm_gem_dmabuf_vunmap);

		/**
		* drm_gem_dmabuf_mmap - dma_buf mmap implementation for GEM
		* @dma_buf: buffer to be mapped
		* @vma: virtual address range
		*
		* Provides memory mapping for the buffer. This can be used as the
		* &dma_buf_ops.mmap callback.
		*
		* Returns 0 on success or a negative error code on failure.
		*/
		int drm_gem_dmabuf_mmap(struct dma_buf dma_buf, struct vm_area_struct vma)
		{
		struct drm_gem_object *obj = dma_buf->priv;
		struct drm_device *dev = obj->dev;
		if (obj->dma_buf) {
		WARN_ON(obj->dma_buf != dma_buf);
		} else {
		obj->dma_buf = dma_buf;
		get_dma_buf(dma_buf);
		}

		if (!dev->driver->gem_prime_mmap)
		return -ENOSYS;
		/* _handle_create_tail unconditionally unlocks dev->object_name_lock. */
		ret = drm_gem_handle_create_tail(file_priv, obj, handle);
		drm_gem_object_put_unlocked(obj);
		if (ret)
		goto out_put;

		return dev->driver->gem_prime_mmap(obj, vma);
		}
		EXPORT_SYMBOL(drm_gem_dmabuf_mmap);
		ret = drm_prime_add_buf_handle(&file_priv->prime,
		dma_buf, *handle);
		mutex_unlock(&file_priv->prime.lock);
		if (ret)
		goto fail;

		static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = {
		.cache_sgt_mapping = true,
		.attach = drm_gem_map_attach,
		.detach = drm_gem_map_detach,
		.map_dma_buf = drm_gem_map_dma_buf,
		.unmap_dma_buf = drm_gem_unmap_dma_buf,
		.release = drm_gem_dmabuf_release,
		.mmap = drm_gem_dmabuf_mmap,
		.vmap = drm_gem_dmabuf_vmap,
		.vunmap = drm_gem_dmabuf_vunmap,
		};
		dma_buf_put(dma_buf);

		/**
		* DOC: PRIME Helpers
		*
		* Drivers can implement @gem_prime_export and @gem_prime_import in terms of
		* simpler APIs by using the helper functions @drm_gem_prime_export and
		* @drm_gem_prime_import. These functions implement dma-buf support in terms of
		* six lower-level driver callbacks:
		*
		* Export callbacks:
		*
		* * @gem_prime_pin (optional): prepare a GEM object for exporting
		* * @gem_prime_get_sg_table: provide a scatter/gather table of pinned pages
		* * @gem_prime_vmap: vmap a buffer exported by your driver
		* * @gem_prime_vunmap: vunmap a buffer exported by your driver
		* * @gem_prime_mmap (optional): mmap a buffer exported by your driver
		*
		* Import callback:
		*
		* * @gem_prime_import_sg_table (import): produce a GEM object from another
		* driver's scatter/gather table
		*/
		return 0;

		/**
		* drm_gem_prime_export - helper library implementation of the export callback
		* @dev: drm_device to export from
		* @obj: GEM object to export
		* @flags: flags like DRM_CLOEXEC and DRM_RDWR
		*
		* This is the implementation of the gem_prime_export functions for GEM drivers
		* using the PRIME helpers.
		fail:
		/* hmm, if driver attached, we are relying on the free-object path
		* to detach.. which seems ok..
		*/
		struct dma_buf drm_gem_prime_export(struct drm_device dev,
		struct drm_gem_object *obj,
		int flags)
		drm_gem_handle_delete(file_priv, *handle);
		dma_buf_put(dma_buf);
		return ret;

		out_unlock:
		mutex_unlock(&dev->object_name_lock);
		out_put:
		mutex_unlock(&file_priv->prime.lock);
		dma_buf_put(dma_buf);
		return ret;
		}
		EXPORT_SYMBOL(drm_gem_prime_fd_to_handle);

		int drm_prime_fd_to_handle_ioctl(struct drm_device dev, void data,
		struct drm_file *file_priv)
		{
		struct dma_buf_export_info exp_info = {
		.exp_name = KBUILD_MODNAME, /* white lie for debug */
		.owner = dev->driver->fops->owner,
		.ops = &drm_gem_prime_dmabuf_ops,
		.size = obj->size,
		.flags = flags,
		.priv = obj,
		.resv = obj->resv,
		};
		struct drm_prime_handle *args = data;

		if (dev->driver->gem_prime_res_obj)
		exp_info.resv = dev->driver->gem_prime_res_obj(obj);
		if (!drm_core_check_feature(dev, DRIVER_PRIME))
		return -EOPNOTSUPP;

		return drm_gem_dmabuf_export(dev, &exp_info);
		if (!dev->driver->prime_fd_to_handle)
		return -ENOSYS;

		return dev->driver->prime_fd_to_handle(dev, file_priv,
		args->fd, &args->handle);
		}
		EXPORT_SYMBOL(drm_gem_prime_export);

		static struct dma_buf export_and_register_object(struct drm_device dev,
		struct drm_gem_object *obj,
		@@ -606,55 +497,325 @@ out:
		out_unlock:
		mutex_unlock(&file_priv->prime.lock);

		return ret;
		return ret;
		}
		EXPORT_SYMBOL(drm_gem_prime_handle_to_fd);

		int drm_prime_handle_to_fd_ioctl(struct drm_device dev, void data,
		struct drm_file *file_priv)
		{
		struct drm_prime_handle *args = data;

		if (!drm_core_check_feature(dev, DRIVER_PRIME))
		return -EOPNOTSUPP;

		if (!dev->driver->prime_handle_to_fd)
		return -ENOSYS;

		/* check flags are valid */
		if (args->flags & ~(DRM_CLOEXEC \| DRM_RDWR))
		return -EINVAL;

		return dev->driver->prime_handle_to_fd(dev, file_priv,
		args->handle, args->flags, &args->fd);
		}

		/**
		* DOC: PRIME Helpers
		*
		* Drivers can implement @gem_prime_export and @gem_prime_import in terms of
		* simpler APIs by using the helper functions @drm_gem_prime_export and
		* @drm_gem_prime_import. These functions implement dma-buf support in terms of
		* six lower-level driver callbacks:
		*
		* Export callbacks:
		*
		* * @gem_prime_pin (optional): prepare a GEM object for exporting
		* * @gem_prime_get_sg_table: provide a scatter/gather table of pinned pages
		* * @gem_prime_vmap: vmap a buffer exported by your driver
		* * @gem_prime_vunmap: vunmap a buffer exported by your driver
		* * @gem_prime_mmap (optional): mmap a buffer exported by your driver
		*
		* Import callback:
		*
		* * @gem_prime_import_sg_table (import): produce a GEM object from another
		* driver's scatter/gather table
		*/

		/**
		* drm_gem_map_attach - dma_buf attach implementation for GEM
		* @dma_buf: buffer to attach device to
		* @attach: buffer attachment data
		*
		* Calls &drm_driver.gem_prime_pin for device specific handling. This can be
		* used as the &dma_buf_ops.attach callback.
		*
		* Returns 0 on success, negative error code on failure.
		*/
		int drm_gem_map_attach(struct dma_buf *dma_buf,
		struct dma_buf_attachment *attach)
		{
		struct drm_gem_object *obj = dma_buf->priv;

		return drm_gem_pin(obj);
		}
		EXPORT_SYMBOL(drm_gem_map_attach);

		/**
		* drm_gem_map_detach - dma_buf detach implementation for GEM
		* @dma_buf: buffer to detach from
		* @attach: attachment to be detached
		*
		* Cleans up &dma_buf_attachment. This can be used as the &dma_buf_ops.detach
		* callback.
		*/
		void drm_gem_map_detach(struct dma_buf *dma_buf,
		struct dma_buf_attachment *attach)
		{
		struct drm_gem_object *obj = dma_buf->priv;

		drm_gem_unpin(obj);
		}
		EXPORT_SYMBOL(drm_gem_map_detach);

		/**
		* drm_gem_map_dma_buf - map_dma_buf implementation for GEM
		* @attach: attachment whose scatterlist is to be returned
		* @dir: direction of DMA transfer
		*
		* Calls &drm_driver.gem_prime_get_sg_table and then maps the scatterlist. This
		* can be used as the &dma_buf_ops.map_dma_buf callback.
		*
		* Returns sg_table containing the scatterlist to be returned; returns ERR_PTR
		* on error. May return -EINTR if it is interrupted by a signal.
		*/

		struct sg_table drm_gem_map_dma_buf(struct dma_buf_attachment attach,
		enum dma_data_direction dir)
		{
		struct drm_gem_object *obj = attach->dmabuf->priv;
		struct sg_table *sgt;

		if (WARN_ON(dir == DMA_NONE))
		return ERR_PTR(-EINVAL);

		if (obj->funcs)
		sgt = obj->funcs->get_sg_table(obj);
		else
		sgt = obj->dev->driver->gem_prime_get_sg_table(obj);

		if (!dma_map_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
		DMA_ATTR_SKIP_CPU_SYNC)) {
		sg_free_table(sgt);
		kfree(sgt);
		sgt = ERR_PTR(-ENOMEM);
		}

		return sgt;
		}
		EXPORT_SYMBOL(drm_gem_map_dma_buf);

		/**
		* drm_gem_unmap_dma_buf - unmap_dma_buf implementation for GEM
		* @attach: attachment to unmap buffer from
		* @sgt: scatterlist info of the buffer to unmap
		* @dir: direction of DMA transfer
		*
		* This can be used as the &dma_buf_ops.unmap_dma_buf callback.
		*/
		void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
		struct sg_table *sgt,
		enum dma_data_direction dir)
		{
		if (!sgt)
		return;

		dma_unmap_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
		DMA_ATTR_SKIP_CPU_SYNC);
		sg_free_table(sgt);
		kfree(sgt);
		}
		EXPORT_SYMBOL(drm_gem_unmap_dma_buf);

		/**
		* drm_gem_dmabuf_vmap - dma_buf vmap implementation for GEM
		* @dma_buf: buffer to be mapped
		*
		* Sets up a kernel virtual mapping. This can be used as the &dma_buf_ops.vmap
		* callback.
		*
		* Returns the kernel virtual address.
		*/
		void drm_gem_dmabuf_vmap(struct dma_buf dma_buf)
		{
		struct drm_gem_object *obj = dma_buf->priv;
		void *vaddr;

		vaddr = drm_gem_vmap(obj);
		if (IS_ERR(vaddr))
		vaddr = NULL;

		return vaddr;
		}
		EXPORT_SYMBOL(drm_gem_dmabuf_vmap);

		/**
		* drm_gem_dmabuf_vunmap - dma_buf vunmap implementation for GEM
		* @dma_buf: buffer to be unmapped
		* @vaddr: the virtual address of the buffer
		*
		* Releases a kernel virtual mapping. This can be used as the
		* &dma_buf_ops.vunmap callback.
		*/
		void drm_gem_dmabuf_vunmap(struct dma_buf dma_buf, void vaddr)
		{
		struct drm_gem_object *obj = dma_buf->priv;

		drm_gem_vunmap(obj, vaddr);
		}
		EXPORT_SYMBOL(drm_gem_dmabuf_vunmap);

		/**
		* drm_gem_prime_mmap - PRIME mmap function for GEM drivers
		* @obj: GEM object
		* @vma: Virtual address range
		*
		* This function sets up a userspace mapping for PRIME exported buffers using
		* the same codepath that is used for regular GEM buffer mapping on the DRM fd.
		* The fake GEM offset is added to vma->vm_pgoff and &drm_driver->fops->mmap is
		* called to set up the mapping.
		*
		* Drivers can use this as their &drm_driver.gem_prime_mmap callback.
		*/
		int drm_gem_prime_mmap(struct drm_gem_object obj, struct vm_area_struct vma)
		{
		struct drm_file *priv;
		struct file *fil;
		int ret;

		priv = kzalloc(sizeof(*priv), GFP_KERNEL);
		fil = kzalloc(sizeof(*fil), GFP_KERNEL);
		if (!priv \|\| !fil) {
		ret = -ENOMEM;
		goto out;
		}

		/* Used by drm_gem_mmap() to lookup the GEM object */
		priv->minor = obj->dev->primary;
		fil->private_data = priv;

		ret = drm_vma_node_allow(&obj->vma_node, priv);
		if (ret)
		goto out;

		vma->vm_pgoff += drm_vma_node_start(&obj->vma_node);

		ret = obj->dev->driver->fops->mmap(fil, vma);

		drm_vma_node_revoke(&obj->vma_node, priv);
		out:
		kfree(priv);
		kfree(fil);

		return ret;
		}
		EXPORT_SYMBOL(drm_gem_prime_mmap);

		/**
		* drm_gem_dmabuf_mmap - dma_buf mmap implementation for GEM
		* @dma_buf: buffer to be mapped
		* @vma: virtual address range
		*
		* Provides memory mapping for the buffer. This can be used as the
		* &dma_buf_ops.mmap callback.
		*
		* Returns 0 on success or a negative error code on failure.
		*/
		int drm_gem_dmabuf_mmap(struct dma_buf dma_buf, struct vm_area_struct vma)
		{
		struct drm_gem_object *obj = dma_buf->priv;
		struct drm_device *dev = obj->dev;

		if (!dev->driver->gem_prime_mmap)
		return -ENOSYS;

		return dev->driver->gem_prime_mmap(obj, vma);
		}
		EXPORT_SYMBOL(drm_gem_prime_handle_to_fd);
		EXPORT_SYMBOL(drm_gem_dmabuf_mmap);

		static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = {
		.cache_sgt_mapping = true,
		.attach = drm_gem_map_attach,
		.detach = drm_gem_map_detach,
		.map_dma_buf = drm_gem_map_dma_buf,
		.unmap_dma_buf = drm_gem_unmap_dma_buf,
		.release = drm_gem_dmabuf_release,
		.mmap = drm_gem_dmabuf_mmap,
		.vmap = drm_gem_dmabuf_vmap,
		.vunmap = drm_gem_dmabuf_vunmap,
		};

		/**
		* drm_gem_prime_mmap - PRIME mmap function for GEM drivers
		* @obj: GEM object
		* @vma: Virtual address range
		*
		* This function sets up a userspace mapping for PRIME exported buffers using
		* the same codepath that is used for regular GEM buffer mapping on the DRM fd.
		* The fake GEM offset is added to vma->vm_pgoff and &drm_driver->fops->mmap is
		* called to set up the mapping.
		* drm_prime_pages_to_sg - converts a page array into an sg list
		* @pages: pointer to the array of page pointers to convert
		* @nr_pages: length of the page vector
		*
		* Drivers can use this as their &drm_driver.gem_prime_mmap callback.
		* This helper creates an sg table object from a set of pages
		* the driver is responsible for mapping the pages into the
		* importers address space for use with dma_buf itself.
		*/
		int drm_gem_prime_mmap(struct drm_gem_object obj, struct vm_area_struct vma)
		struct sg_table drm_prime_pages_to_sg(struct page *pages, unsigned int nr_pages)
		{
		struct drm_file *priv;
		struct file *fil;
		struct sg_table *sg = NULL;
		int ret;

		priv = kzalloc(sizeof(*priv), GFP_KERNEL);
		fil = kzalloc(sizeof(*fil), GFP_KERNEL);
		if (!priv \|\| !fil) {
		sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
		if (!sg) {
		ret = -ENOMEM;
		goto out;
		}

		/* Used by drm_gem_mmap() to lookup the GEM object */
		priv->minor = obj->dev->primary;
		fil->private_data = priv;

		ret = drm_vma_node_allow(&obj->vma_node, priv);
		ret = sg_alloc_table_from_pages(sg, pages, nr_pages, 0,
		nr_pages << PAGE_SHIFT, GFP_KERNEL);
		if (ret)
		goto out;

		vma->vm_pgoff += drm_vma_node_start(&obj->vma_node);
		return sg;
		out:
		kfree(sg);
		return ERR_PTR(ret);
		}
		EXPORT_SYMBOL(drm_prime_pages_to_sg);

		ret = obj->dev->driver->fops->mmap(fil, vma);
		/**
		* drm_gem_prime_export - helper library implementation of the export callback
		* @dev: drm_device to export from
		* @obj: GEM object to export
		* @flags: flags like DRM_CLOEXEC and DRM_RDWR
		*
		* This is the implementation of the gem_prime_export functions for GEM drivers
		* using the PRIME helpers.
		*/
		struct dma_buf drm_gem_prime_export(struct drm_device dev,
		struct drm_gem_object *obj,
		int flags)
		{
		struct dma_buf_export_info exp_info = {
		.exp_name = KBUILD_MODNAME, /* white lie for debug */
		.owner = dev->driver->fops->owner,
		.ops = &drm_gem_prime_dmabuf_ops,
		.size = obj->size,
		.flags = flags,
		.priv = obj,
		.resv = obj->resv,
		};

		drm_vma_node_revoke(&obj->vma_node, priv);
		out:
		kfree(priv);
		kfree(fil);
		if (dev->driver->gem_prime_res_obj)
		exp_info.resv = dev->driver->gem_prime_res_obj(obj);

		return ret;
		return drm_gem_dmabuf_export(dev, &exp_info);
		}
		EXPORT_SYMBOL(drm_gem_prime_mmap);
		EXPORT_SYMBOL(drm_gem_prime_export);

		/**
		* drm_gem_prime_import_dev - core implementation of the import callback
		@@ -737,154 +898,6 @@ struct drm_gem_object drm_gem_prime_import(struct drm_device dev,
		}
		EXPORT_SYMBOL(drm_gem_prime_import);

		/**
		* drm_gem_prime_fd_to_handle - PRIME import function for GEM drivers
		* @dev: dev to export the buffer from
		* @file_priv: drm file-private structure
		* @prime_fd: fd id of the dma-buf which should be imported
		* @handle: pointer to storage for the handle of the imported buffer object
		*
		* This is the PRIME import function which must be used mandatorily by GEM
		* drivers to ensure correct lifetime management of the underlying GEM object.
		* The actual importing of GEM object from the dma-buf is done through the
		* gem_import_export driver callback.
		*/
		int drm_gem_prime_fd_to_handle(struct drm_device *dev,
		struct drm_file *file_priv, int prime_fd,
		uint32_t *handle)
		{
		struct dma_buf *dma_buf;
		struct drm_gem_object *obj;
		int ret;

		dma_buf = dma_buf_get(prime_fd);
		if (IS_ERR(dma_buf))
		return PTR_ERR(dma_buf);

		mutex_lock(&file_priv->prime.lock);

		ret = drm_prime_lookup_buf_handle(&file_priv->prime,
		dma_buf, handle);
		if (ret == 0)
		goto out_put;

		/* never seen this one, need to import */
		mutex_lock(&dev->object_name_lock);
		if (dev->driver->gem_prime_import)
		obj = dev->driver->gem_prime_import(dev, dma_buf);
		else
		obj = drm_gem_prime_import(dev, dma_buf);
		if (IS_ERR(obj)) {
		ret = PTR_ERR(obj);
		goto out_unlock;
		}

		if (obj->dma_buf) {
		WARN_ON(obj->dma_buf != dma_buf);
		} else {
		obj->dma_buf = dma_buf;
		get_dma_buf(dma_buf);
		}

		/* _handle_create_tail unconditionally unlocks dev->object_name_lock. */
		ret = drm_gem_handle_create_tail(file_priv, obj, handle);
		drm_gem_object_put_unlocked(obj);
		if (ret)
		goto out_put;

		ret = drm_prime_add_buf_handle(&file_priv->prime,
		dma_buf, *handle);
		mutex_unlock(&file_priv->prime.lock);
		if (ret)
		goto fail;

		dma_buf_put(dma_buf);

		return 0;

		fail:
		/* hmm, if driver attached, we are relying on the free-object path
		* to detach.. which seems ok..
		*/
		drm_gem_handle_delete(file_priv, *handle);
		dma_buf_put(dma_buf);
		return ret;

		out_unlock:
		mutex_unlock(&dev->object_name_lock);
		out_put:
		mutex_unlock(&file_priv->prime.lock);
		dma_buf_put(dma_buf);
		return ret;
		}
		EXPORT_SYMBOL(drm_gem_prime_fd_to_handle);

		int drm_prime_handle_to_fd_ioctl(struct drm_device dev, void data,
		struct drm_file *file_priv)
		{
		struct drm_prime_handle *args = data;

		if (!drm_core_check_feature(dev, DRIVER_PRIME))
		return -EOPNOTSUPP;

		if (!dev->driver->prime_handle_to_fd)
		return -ENOSYS;

		/* check flags are valid */
		if (args->flags & ~(DRM_CLOEXEC \| DRM_RDWR))
		return -EINVAL;

		return dev->driver->prime_handle_to_fd(dev, file_priv,
		args->handle, args->flags, &args->fd);
		}

		int drm_prime_fd_to_handle_ioctl(struct drm_device dev, void data,
		struct drm_file *file_priv)
		{
		struct drm_prime_handle *args = data;

		if (!drm_core_check_feature(dev, DRIVER_PRIME))
		return -EOPNOTSUPP;

		if (!dev->driver->prime_fd_to_handle)
		return -ENOSYS;

		return dev->driver->prime_fd_to_handle(dev, file_priv,
		args->fd, &args->handle);
		}

		/**
		* drm_prime_pages_to_sg - converts a page array into an sg list
		* @pages: pointer to the array of page pointers to convert
		* @nr_pages: length of the page vector
		*
		* This helper creates an sg table object from a set of pages
		* the driver is responsible for mapping the pages into the
		* importers address space for use with dma_buf itself.
		*/
		struct sg_table drm_prime_pages_to_sg(struct page *pages, unsigned int nr_pages)
		{
		struct sg_table *sg = NULL;
		int ret;

		sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
		if (!sg) {
		ret = -ENOMEM;
		goto out;
		}

		ret = sg_alloc_table_from_pages(sg, pages, nr_pages, 0,
		nr_pages << PAGE_SHIFT, GFP_KERNEL);
		if (ret)
		goto out;

		return sg;
		out:
		kfree(sg);
		return ERR_PTR(ret);
		}
		EXPORT_SYMBOL(drm_prime_pages_to_sg);

		/**
		* drm_prime_sg_to_page_addr_arrays - convert an sg table into a page array
		* @sgt: scatter-gather table to convert
		@@ -949,16 +962,3 @@ void drm_prime_gem_destroy(struct drm_gem_object obj, struct sg_table sg)
		dma_buf_put(dma_buf);
		}
		EXPORT_SYMBOL(drm_prime_gem_destroy);

		void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv)
		{
		mutex_init(&prime_fpriv->lock);
		prime_fpriv->dmabufs = RB_ROOT;
		prime_fpriv->handles = RB_ROOT;
		}

		void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv)
		{
		/* by now drm_gem_release should've made sure the list is empty */
		WARN_ON(!RB_EMPTY_ROOT(&prime_fpriv->dmabufs));
		}

include/drm/drm_prime.h

+24 −18

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