36 #include <linux/file.h>
70  * DOC: file operations
72  * Drivers must define the file operations structure that forms the DRM
85  * userspace through the file descriptor. They are used to send vblank event and
95  * No other file operations are supported by the DRM userspace API. Overall the
120  * drm_file_alloc - allocate file context
123  * This allocates a new DRM file context. It is not linked into any context and
134 	struct drm_file *file;  in drm_file_alloc()  local
137 	file = kzalloc(sizeof(*file), GFP_KERNEL);  in drm_file_alloc()
138 	if (!file)  in drm_file_alloc()
142 	file->client_id = atomic64_inc_return(&ident);  in drm_file_alloc()
143 	rcu_assign_pointer(file->pid, get_pid(task_tgid(current)));  in drm_file_alloc()
144 	file->minor = minor;  in drm_file_alloc()
147 	file->authenticated = capable(CAP_SYS_ADMIN);  in drm_file_alloc()
149 	INIT_LIST_HEAD(&file->lhead);  in drm_file_alloc()
150 	INIT_LIST_HEAD(&file->fbs);  in drm_file_alloc()
151 	mutex_init(&file->fbs_lock);  in drm_file_alloc()
152 	INIT_LIST_HEAD(&file->blobs);  in drm_file_alloc()
153 	INIT_LIST_HEAD(&file->pending_event_list);  in drm_file_alloc()
154 	INIT_LIST_HEAD(&file->event_list);  in drm_file_alloc()
155 	init_waitqueue_head(&file->event_wait);  in drm_file_alloc()
156 	file->event_space = 4096; /* set aside 4k for event buffer */  in drm_file_alloc()
158 	spin_lock_init(&file->master_lookup_lock);  in drm_file_alloc()
159 	mutex_init(&file->event_read_lock);  in drm_file_alloc()
162 		drm_gem_open(dev, file);  in drm_file_alloc()
165 		drm_syncobj_open(file);  in drm_file_alloc()
167 	drm_prime_init_file_private(&file->prime);  in drm_file_alloc()
170 		ret = dev->driver->open(dev, file);  in drm_file_alloc()
175 	return file;  in drm_file_alloc()
178 	drm_prime_destroy_file_private(&file->prime);  in drm_file_alloc()
180 		drm_syncobj_release(file);  in drm_file_alloc()
182 		drm_gem_release(dev, file);  in drm_file_alloc()
183 	put_pid(rcu_access_pointer(file->pid));  in drm_file_alloc()
184 	kfree(file);  in drm_file_alloc()
214  * drm_file_free - free file context
215  * @file: context to free, or NULL
217  * This destroys and deallocates a DRM file context previously allocated via
223 void drm_file_free(struct drm_file *file)  in drm_file_free()  argument
227 	if (!file)  in drm_file_free()
230 	dev = file->minor->dev;  in drm_file_free()
234 		     (long)old_encode_dev(file->minor->kdev->devt),  in drm_file_free()
237 	drm_events_release(file);  in drm_file_free()
240 		drm_fb_release(file);  in drm_file_free()
241 		drm_property_destroy_user_blobs(dev, file);  in drm_file_free()
245 		drm_syncobj_release(file);  in drm_file_free()
248 		drm_gem_release(dev, file);  in drm_file_free()
250 	if (drm_is_primary_client(file))  in drm_file_free()
251 		drm_master_release(file);  in drm_file_free()
254 		dev->driver->postclose(dev, file);  in drm_file_free()
256 	drm_prime_destroy_file_private(&file->prime);  in drm_file_free()
258 	WARN_ON(!list_empty(&file->event_list));  in drm_file_free()
260 	put_pid(rcu_access_pointer(file->pid));  in drm_file_free()
261 	kfree(file);  in drm_file_free()
264 static void drm_close_helper(struct file *filp)  in drm_close_helper()
292  * \param filp file pointer.
296  * Creates and initializes a drm_file structure for the file private data in \p
299 int drm_open_helper(struct file *filp, struct drm_minor *minor)  in drm_open_helper()
341  * drm_open - open method for DRM file
343  * @filp: file pointer.
346  * It looks up the correct DRM device and instantiates all the per-file
352 int drm_open(struct inode *inode, struct file *filp)  in drm_open()
398  * drm_release - release method for DRM file
400  * @filp: file pointer.
403  * method. It frees any resources associated with the open file. If this
404  * is the last open file for the DRM device, it also restores the active
410 int drm_release(struct inode *inode, struct file *filp)  in drm_release()
468  * drm_release_noglobal - release method for DRM file
470  * @filp: file pointer.
473  * method. It frees any resources associated with the open file prior to taking
474  * the drm_global_mutex. If this is the last open file for the DRM device, it
480 int drm_release_noglobal(struct inode *inode, struct file *filp)  in drm_release_noglobal()
500  * drm_read - read method for DRM file
501  * @filp: file pointer
523 ssize_t drm_read(struct file *filp, char __user *buffer,  in drm_read()
593  * drm_poll - poll method for DRM file
594  * @filp: file pointer
605  * Mask of POLL flags indicating the current status of the file.
607 __poll_t drm_poll(struct file *filp, struct poll_table_struct *wait)  in drm_poll()
624  * @file_priv: DRM file private data
665  * @file_priv: DRM file private data
761  * drm_send_event_timestamp_locked - send DRM event to file descriptor
768  * to its associated userspace DRM file. Callers must already hold
772  * corresponding DRM file is closed. Drivers need not worry about whether the
773  * DRM file for this event still exists and can call this function upon
784  * drm_send_event_locked - send DRM event to file descriptor
789  * to its associated userspace DRM file. Callers must already hold
793  * corresponding DRM file is closed. Drivers need not worry about whether the
794  * DRM file for this event still exists and can call this function upon
804  * drm_send_event - send DRM event to file descriptor
809  * to its associated userspace DRM file. This function acquires
814  * corresponding DRM file is closed. Drivers need not worry about whether the
815  * DRM file for this event still exists and can call this function upon
871  * @file: the DRM file
874  * file.
876 void drm_show_memory_stats(struct drm_printer *p, struct drm_file *file)  in drm_show_memory_stats()  argument
883 	spin_lock(&file->table_lock);  in drm_show_memory_stats()
884 	idr_for_each_entry (&file->object_idr, obj, id) {  in drm_show_memory_stats()
920 	spin_unlock(&file->table_lock);  in drm_show_memory_stats()
927  * drm_show_fdinfo - helper for drm file fops
929  * @f: the device file instance
936 void drm_show_fdinfo(struct seq_file *m, struct file *f)  in drm_show_fdinfo()
938 	struct drm_file *file = f->private_data;  in drm_show_fdinfo()  local
939 	struct drm_device *dev = file->minor->dev;  in drm_show_fdinfo()
943 	drm_printf(&p, "drm-client-id:\t%llu\n", file->client_id);  in drm_show_fdinfo()
954 		dev->driver->show_fdinfo(&p, file);  in drm_show_fdinfo()
959  * mock_drm_getfile - Create a new struct file for the drm device
961  * @flags: file creation mode (O_RDWR etc)
963  * This create a new struct file that wraps a DRM file context around a
965  * invoking userspace. The struct file may be operated on using its f_op
970  * Pointer to newly created struct file, ERR_PTR on failure.
972 struct file *mock_drm_getfile(struct drm_minor *minor, unsigned int flags)  in mock_drm_getfile()
976 	struct file *file;  in mock_drm_getfile()  local
982 	file = anon_inode_getfile("drm", dev->driver->fops, priv, flags);  in mock_drm_getfile()
983 	if (IS_ERR(file)) {  in mock_drm_getfile()
985 		return file;  in mock_drm_getfile()
989 	file->f_mapping = dev->anon_inode->i_mapping;  in mock_drm_getfile()
992 	priv->filp = file;  in mock_drm_getfile()
994 	return file;  in mock_drm_getfile()