36 #include <linux/file.h>
86  * DOC: file operations
88  * Drivers must define the file operations structure that forms the DRM
101  * userspace through the file descriptor. They are used to send vblank event and
113  * No other file operations are supported by the DRM userspace API. Overall the
139  * drm_file_alloc - allocate file context
142  * This allocates a new DRM file context. It is not linked into any context and
152 	struct drm_file *file;  in drm_file_alloc()  local
155 	file = kzalloc(sizeof(*file), GFP_KERNEL);  in drm_file_alloc()
156 	if (!file)  in drm_file_alloc()
159 	file->pid = get_pid(task_pid(current));  in drm_file_alloc()
160 	file->minor = minor;  in drm_file_alloc()
163 	file->authenticated = capable(CAP_SYS_ADMIN);  in drm_file_alloc()
165 	INIT_LIST_HEAD(&file->lhead);  in drm_file_alloc()
166 	INIT_LIST_HEAD(&file->fbs);  in drm_file_alloc()
167 	mutex_init(&file->fbs_lock);  in drm_file_alloc()
168 	INIT_LIST_HEAD(&file->blobs);  in drm_file_alloc()
169 	INIT_LIST_HEAD(&file->pending_event_list);  in drm_file_alloc()
170 	INIT_LIST_HEAD(&file->event_list);  in drm_file_alloc()
171 	init_waitqueue_head(&file->event_wait);  in drm_file_alloc()
172 	file->event_space = 4096; /* set aside 4k for event buffer */  in drm_file_alloc()
174 	spin_lock_init(&file->master_lookup_lock);  in drm_file_alloc()
175 	mutex_init(&file->event_read_lock);  in drm_file_alloc()
178 		drm_gem_open(dev, file);  in drm_file_alloc()
181 		drm_syncobj_open(file);  in drm_file_alloc()
183 	drm_prime_init_file_private(&file->prime);  in drm_file_alloc()
186 		ret = dev->driver->open(dev, file);  in drm_file_alloc()
191 	return file;  in drm_file_alloc()
194 	drm_prime_destroy_file_private(&file->prime);  in drm_file_alloc()
196 		drm_syncobj_release(file);  in drm_file_alloc()
198 		drm_gem_release(dev, file);  in drm_file_alloc()
199 	put_pid(file->pid);  in drm_file_alloc()
200 	kfree(file);  in drm_file_alloc()
230  * drm_file_free - free file context
231  * @file: context to free, or NULL
233  * This destroys and deallocates a DRM file context previously allocated via
239 void drm_file_free(struct drm_file *file)  in drm_file_free()  argument
243 	if (!file)  in drm_file_free()
246 	dev = file->minor->dev;  in drm_file_free()
250 		  (long)old_encode_dev(file->minor->kdev->devt),  in drm_file_free()
256 		dev->driver->preclose(dev, file);  in drm_file_free()
260 		drm_legacy_lock_release(dev, file->filp);  in drm_file_free()
263 		drm_legacy_reclaim_buffers(dev, file);  in drm_file_free()
265 	drm_events_release(file);  in drm_file_free()
268 		drm_fb_release(file);  in drm_file_free()
269 		drm_property_destroy_user_blobs(dev, file);  in drm_file_free()
273 		drm_syncobj_release(file);  in drm_file_free()
276 		drm_gem_release(dev, file);  in drm_file_free()
278 	drm_legacy_ctxbitmap_flush(dev, file);  in drm_file_free()
280 	if (drm_is_primary_client(file))  in drm_file_free()
281 		drm_master_release(file);  in drm_file_free()
284 		dev->driver->postclose(dev, file);  in drm_file_free()
286 	drm_prime_destroy_file_private(&file->prime);  in drm_file_free()
288 	WARN_ON(!list_empty(&file->event_list));  in drm_file_free()
290 	put_pid(file->pid);  in drm_file_free()
291 	kfree(file);  in drm_file_free()
294 static void drm_close_helper(struct file *filp)  in drm_close_helper()
322  * \param filp file pointer.
326  * Creates and initializes a drm_file structure for the file private data in \p
329 static int drm_open_helper(struct file *filp, struct drm_minor *minor)  in drm_open_helper()
393  * drm_open - open method for DRM file
395  * @filp: file pointer.
398  * It looks up the correct DRM device and instantiates all the per-file
405 int drm_open(struct inode *inode, struct file *filp)  in drm_open()
466  * drm_release - release method for DRM file
468  * @filp: file pointer.
471  * method. It frees any resources associated with the open file, and calls the
472  * &drm_driver.postclose driver callback. If this is the last open file for the
479 int drm_release(struct inode *inode, struct file *filp)  in drm_release()
505  * drm_release_noglobal - release method for DRM file
507  * @filp: file pointer.
510  * method. It frees any resources associated with the open file prior to taking
512  * callback. If this is the last open file for the DRM device also proceeds to
519 int drm_release_noglobal(struct inode *inode, struct file *filp)  in drm_release_noglobal()
539  * drm_read - read method for DRM file
540  * @filp: file pointer
563 ssize_t drm_read(struct file *filp, char __user *buffer,  in drm_read()
633  * drm_poll - poll method for DRM file
634  * @filp: file pointer
646  * Mask of POLL flags indicating the current status of the file.
648 __poll_t drm_poll(struct file *filp, struct poll_table_struct *wait)  in drm_poll()
665  * @file_priv: DRM file private data
707  * @file_priv: DRM file private data
804  * drm_send_event_timestamp_locked - send DRM event to file descriptor
811  * to its associated userspace DRM file. Callers must already hold
815  * corresponding DRM file is closed. Drivers need not worry about whether the
816  * DRM file for this event still exists and can call this function upon
827  * drm_send_event_locked - send DRM event to file descriptor
832  * to its associated userspace DRM file. Callers must already hold
836  * corresponding DRM file is closed. Drivers need not worry about whether the
837  * DRM file for this event still exists and can call this function upon
847  * drm_send_event - send DRM event to file descriptor
852  * to its associated userspace DRM file. This function acquires
857  * corresponding DRM file is closed. Drivers need not worry about whether the
858  * DRM file for this event still exists and can call this function upon
872  * mock_drm_getfile - Create a new struct file for the drm device
874  * @flags: file creation mode (O_RDWR etc)
876  * This create a new struct file that wraps a DRM file context around a
878  * invoking userspace. The struct file may be operated on using its f_op
883  * Pointer to newly created struct file, ERR_PTR on failure.
885 struct file *mock_drm_getfile(struct drm_minor *minor, unsigned int flags)  in mock_drm_getfile()
889 	struct file *file;  in mock_drm_getfile()  local
895 	file = anon_inode_getfile("drm", dev->driver->fops, priv, flags);  in mock_drm_getfile()
896 	if (IS_ERR(file)) {  in mock_drm_getfile()
898 		return file;  in mock_drm_getfile()
902 	file->f_mapping = dev->anon_inode->i_mapping;  in mock_drm_getfile()
905 	priv->filp = file;  in mock_drm_getfile()
907 	return file;  in mock_drm_getfile()