56  *  - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm
58  *  - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All
60  *  - The internal set_busid kernel functions and driver callbacks are
63  *  - Other ioctls and functions involved are named consistently.
76  *    side-effect this fills out the unique name in the master structure.
77  * 2. Call GET_UNIQUE to read out the unique name from the master structure,
85  *    means the unique name for the master node just opening is _not_ filled
119 	struct drm_master *master;  in drm_getunique()  local
121 	mutex_lock(&dev->master_mutex);  in drm_getunique()
122 	master = file_priv->master;  in drm_getunique()
123 	if (u->unique_len >= master->unique_len) {  in drm_getunique()
124 		if (copy_to_user(u->unique, master->unique, master->unique_len)) {  in drm_getunique()
125 			mutex_unlock(&dev->master_mutex);  in drm_getunique()
126 			return -EFAULT;  in drm_getunique()
129 	u->unique_len = master->unique_len;  in drm_getunique()
130 	mutex_unlock(&dev->master_mutex);  in drm_getunique()
137 		struct drm_master *master)  in drm_unset_busid()  argument
139 	kfree(master->unique);  in drm_unset_busid()
140 	master->unique = NULL;  in drm_unset_busid()
141 	master->unique_len = 0;  in drm_unset_busid()
146 	struct drm_master *master = file_priv->master;  in drm_set_busid()  local
149 	if (master->unique != NULL)  in drm_set_busid()
150 		drm_unset_busid(dev, master);  in drm_set_busid()
152 	if (dev->dev && dev_is_pci(dev->dev)) {  in drm_set_busid()
153 		ret = drm_pci_set_busid(dev, master);  in drm_set_busid()
155 			drm_unset_busid(dev, master);  in drm_set_busid()
159 		WARN_ON(!dev->unique);  in drm_set_busid()
160 		master->unique = kstrdup(dev->unique, GFP_KERNEL);  in drm_set_busid()
161 		if (master->unique)  in drm_set_busid()
162 			master->unique_len = strlen(dev->unique);  in drm_set_busid()
187 	 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools  in drm_getclient()
189 	 * get -EINVAL, hence this is the return value we need to hand back for  in drm_getclient()
197 	if (client->idx == 0) {  in drm_getclient()
198 		client->auth = file_priv->authenticated;  in drm_getclient()
199 		client->pid = task_pid_vnr(current);  in drm_getclient()
200 		client->uid = overflowuid;  in drm_getclient()
201 		client->magic = 0;  in drm_getclient()
202 		client->iocs = 0;  in drm_getclient()
206 		return -EINVAL;  in drm_getclient()
223 	struct drm_stats *stats = data;  in drm_getstats()  local
225 	/* Clear stats to prevent userspace from eating its stack garbage. */  in drm_getstats()
226 	memset(stats, 0, sizeof(*stats));  in drm_getstats()
239 	req->value = 0;  in drm_getcap()
241 	/* Only some caps make sense with UMS/render-only drivers. */  in drm_getcap()
242 	switch (req->capability) {  in drm_getcap()
244 		req->value = 1;  in drm_getcap()
247 		req->value = DRM_PRIME_CAP_IMPORT | DRM_PRIME_CAP_EXPORT;  in drm_getcap()
250 		req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ);  in drm_getcap()
253 		req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE);  in drm_getcap()
259 		return -EOPNOTSUPP;  in drm_getcap()
261 	switch (req->capability) {  in drm_getcap()
263 		if (dev->driver->dumb_create)  in drm_getcap()
264 			req->value = 1;  in drm_getcap()
267 		req->value = 1;  in drm_getcap()
270 		req->value = dev->mode_config.preferred_depth;  in drm_getcap()
273 		req->value = dev->mode_config.prefer_shadow;  in drm_getcap()
276 		req->value = dev->mode_config.async_page_flip;  in drm_getcap()
279 		req->value = 1;  in drm_getcap()
281 			if (!crtc->funcs->page_flip_target)  in drm_getcap()
282 				req->value = 0;  in drm_getcap()
286 		if (dev->mode_config.cursor_width)  in drm_getcap()
287 			req->value = dev->mode_config.cursor_width;  in drm_getcap()
289 			req->value = 64;  in drm_getcap()
292 		if (dev->mode_config.cursor_height)  in drm_getcap()
293 			req->value = dev->mode_config.cursor_height;  in drm_getcap()
295 			req->value = 64;  in drm_getcap()
298 		req->value = !dev->mode_config.fb_modifiers_not_supported;  in drm_getcap()
301 		req->value = 1;  in drm_getcap()
304 		req->value = drm_core_check_feature(dev, DRIVER_ATOMIC) &&  in drm_getcap()
305 			     dev->mode_config.async_page_flip;  in drm_getcap()
308 		return -EINVAL;  in drm_getcap()
321 	/* No render-only settable capabilities for now */  in drm_setclientcap()
325 		return -EOPNOTSUPP;  in drm_setclientcap()
327 	switch (req->capability) {  in drm_setclientcap()
329 		if (req->value > 1)  in drm_setclientcap()
330 			return -EINVAL;  in drm_setclientcap()
331 		file_priv->stereo_allowed = req->value;  in drm_setclientcap()
334 		if (req->value > 1)  in drm_setclientcap()
335 			return -EINVAL;  in drm_setclientcap()
336 		file_priv->universal_planes = req->value;  in drm_setclientcap()
340 			return -EOPNOTSUPP;  in drm_setclientcap()
342 		if (current->comm[0] == 'X' && req->value == 1) {  in drm_setclientcap()
344 			return -EOPNOTSUPP;  in drm_setclientcap()
346 		if (req->value > 2)  in drm_setclientcap()
347 			return -EINVAL;  in drm_setclientcap()
348 		file_priv->atomic = req->value;  in drm_setclientcap()
349 		file_priv->universal_planes = req->value;  in drm_setclientcap()
351 		 * No atomic user-space blows up on aspect ratio mode bits.  in drm_setclientcap()
353 		file_priv->aspect_ratio_allowed = req->value;  in drm_setclientcap()
356 		if (req->value > 1)  in drm_setclientcap()
357 			return -EINVAL;  in drm_setclientcap()
358 		file_priv->aspect_ratio_allowed = req->value;  in drm_setclientcap()
361 		if (!file_priv->atomic)  in drm_setclientcap()
362 			return -EINVAL;  in drm_setclientcap()
363 		if (req->value > 1)  in drm_setclientcap()
364 			return -EINVAL;  in drm_setclientcap()
365 		file_priv->writeback_connectors = req->value;  in drm_setclientcap()
369 			return -EOPNOTSUPP;  in drm_setclientcap()
370 		if (!file_priv->atomic)  in drm_setclientcap()
371 			return -EINVAL;  in drm_setclientcap()
372 		if (req->value > 1)  in drm_setclientcap()
373 			return -EINVAL;  in drm_setclientcap()
374 		file_priv->supports_virtualized_cursor_plane = req->value;  in drm_setclientcap()
377 		return -EINVAL;  in drm_setclientcap()
399 	mutex_lock(&dev->master_mutex);  in drm_setversion()
400 	if (sv->drm_di_major != -1) {  in drm_setversion()
401 		if (sv->drm_di_major != DRM_IF_MAJOR ||  in drm_setversion()
402 		    sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {  in drm_setversion()
403 			retcode = -EINVAL;  in drm_setversion()
406 		if_version = DRM_IF_VERSION(sv->drm_di_major,  in drm_setversion()
407 					    sv->drm_di_minor);  in drm_setversion()
408 		dev->if_version = max(if_version, dev->if_version);  in drm_setversion()
409 		if (sv->drm_di_minor >= 1) {  in drm_setversion()
420 	if (sv->drm_dd_major != -1) {  in drm_setversion()
421 		if (sv->drm_dd_major != dev->driver->major ||  in drm_setversion()
422 		    sv->drm_dd_minor < 0 || sv->drm_dd_minor >  in drm_setversion()
423 		    dev->driver->minor) {  in drm_setversion()
424 			retcode = -EINVAL;  in drm_setversion()
430 	sv->drm_di_major = DRM_IF_MAJOR;  in drm_setversion()
431 	sv->drm_di_minor = DRM_IF_MINOR;  in drm_setversion()
432 	sv->drm_dd_major = dev->driver->major;  in drm_setversion()
433 	sv->drm_dd_minor = dev->driver->minor;  in drm_setversion()
434 	mutex_unlock(&dev->master_mutex);  in drm_setversion()
440  * drm_noop - DRM no-op ioctl implementation
445  * This no-op implementation for drm ioctls is useful for deprecated
460  * drm_invalid_op - DRM invalid ioctl implementation
465  * This no-op implementation for drm ioctls is useful for deprecated
472  * Always fails with a return value of -EINVAL.
477 	return -EINVAL;  in drm_invalid_op()
500 	 * larger than the userspace-supplied buffer) */  in drm_copy_field()
506 			return -EFAULT;  in drm_copy_field()
527 	version->version_major = dev->driver->major;  in drm_version()
528 	version->version_minor = dev->driver->minor;  in drm_version()
529 	version->version_patchlevel = dev->driver->patchlevel;  in drm_version()
530 	err = drm_copy_field(version->name, &version->name_len,  in drm_version()
531 			dev->driver->name);  in drm_version()
533 	/* Driver date is deprecated. Userspace expects a non-empty string. */  in drm_version()
535 		err = drm_copy_field(version->date, &version->date_len, "0");  in drm_version()
537 		err = drm_copy_field(version->desc, &version->desc_len,  in drm_version()
538 				dev->driver->desc);  in drm_version()
547 		return -EACCES;  in drm_ioctl_permit()
551 		     !file_priv->authenticated))  in drm_ioctl_permit()
552 		return -EACCES;  in drm_ioctl_permit()
554 	/* MASTER is only for master or control clients */  in drm_ioctl_permit()
557 		return -EACCES;  in drm_ioctl_permit()
562 		return -EACCES;  in drm_ioctl_permit()
686  * which define IOCTL for use by the display DRM master, but they all predate
702  * ``Documentation/process/botching-up-ioctls.rst``. Note that drm_ioctl()
703  * automatically zero-extends structures, hence make sure you can add more stuff
725  * the driver-specific IOCTLs are wired up.
731 	struct drm_file *file_priv = file->private_data;  in drm_ioctl_kernel()
732 	struct drm_device *dev = file_priv->minor->dev;  in drm_ioctl_kernel()
739 		return -ENODEV;  in drm_ioctl_kernel()
750  * drm_ioctl - ioctl callback implementation for DRM drivers
765 	struct drm_file *file_priv = filp->private_data;  in drm_ioctl()
770 	int retcode = -EINVAL;  in drm_ioctl()
776 	dev = file_priv->minor->dev;  in drm_ioctl()
779 		return -ENODEV;  in drm_ioctl()
782 		return -ENOTTY;  in drm_ioctl()
788 		unsigned int index = nr - DRM_COMMAND_BASE;  in drm_ioctl()
790 		if (index >= dev->driver->num_ioctls)  in drm_ioctl()
792 		index = array_index_nospec(index, dev->driver->num_ioctls);  in drm_ioctl()
793 		ioctl = &dev->driver->ioctls[index];  in drm_ioctl()
802 	drv_size = _IOC_SIZE(ioctl->cmd);  in drm_ioctl()
804 	if ((cmd & ioctl->cmd & IOC_IN) == 0)  in drm_ioctl()
806 	if ((cmd & ioctl->cmd & IOC_OUT) == 0)  in drm_ioctl()
811 		     current->comm, task_pid_nr(current),  in drm_ioctl()
812 		     (long)old_encode_dev(file_priv->minor->kdev->devt),  in drm_ioctl()
813 		     file_priv->authenticated, ioctl->name);  in drm_ioctl()
816 	func = ioctl->func;  in drm_ioctl()
820 		retcode = -EINVAL;  in drm_ioctl()
829 			retcode = -ENOMEM;  in drm_ioctl()
835 		retcode = -EFAULT;  in drm_ioctl()
840 		memset(kdata + in_size, 0, ksize - in_size);  in drm_ioctl()
842 	retcode = drm_ioctl_kernel(filp, func, kdata, ioctl->flags);  in drm_ioctl()
844 		retcode = -EFAULT;  in drm_ioctl()
850 			     current->comm, task_pid_nr(current),  in drm_ioctl()
851 			     (long)old_encode_dev(file_priv->minor->kdev->devt),  in drm_ioctl()
852 			     file_priv->authenticated, cmd, nr);  in drm_ioctl()
858 			     current->comm, task_pid_nr(current), retcode);  in drm_ioctl()
864  * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags