drivers/gpu/drm/drm_ioctl.c - kernel/msm-4.9 - Gitiles

 /**
  * \file drm_ioctl.c
  * IOCTL processing for DRM
  *
  * \author Rickard E. (Rik) Faith <faith@valinux.com>
  * \author Gareth Hughes <gareth@valinux.com>
  */

 /*
  * Created: Fri Jan  8 09:01:26 1999 by faith@valinux.com
  *
  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  * All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice (including the next
  * paragraph) shall be included in all copies or substantial portions of the
  * Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  * OTHER DEALINGS IN THE SOFTWARE.
  */

 #include <drm/drmP.h>
 #include <drm/drm_core.h>

 #include <linux/pci.h>
 #include <linux/export.h>
 #ifdef CONFIG_X86
 #include <asm/mtrr.h>
 #endif

 /**
  * Get the bus id.
  *
  * \param inode device inode.
  * \param file_priv DRM file private.
  * \param cmd command.
  * \param arg user argument, pointing to a drm_unique structure.
  * \return zero on success or a negative number on failure.
  *
  * Copies the bus id from drm_device::unique into user space.
  */
 int drm_getunique(struct drm_device *dev, void *data,
 		  struct drm_file *file_priv)
 {
 	struct drm_unique *u = data;
 	struct drm_master *master = file_priv->master;

 	if (u->unique_len >= master->unique_len) {
 		if (copy_to_user(u->unique, master->unique, master->unique_len))
 			return -EFAULT;
 	}
 	u->unique_len = master->unique_len;

 	return 0;
 }

 static void
 drm_unset_busid(struct drm_device *dev,
 		struct drm_master *master)
 {
 	kfree(master->unique);
 	master->unique = NULL;
 	master->unique_len = 0;
 	master->unique_size = 0;
 }

 /**
  * Set the bus id.
  *
  * \param inode device inode.
  * \param file_priv DRM file private.
  * \param cmd command.
  * \param arg user argument, pointing to a drm_unique structure.
  * \return zero on success or a negative number on failure.
  *
  * Copies the bus id from userspace into drm_device::unique, and verifies that
  * it matches the device this DRM is attached to (EINVAL otherwise).  Deprecated
  * in interface version 1.1 and will return EBUSY when setversion has requested
  * version 1.1 or greater. Also note that KMS is all version 1.1 and later and
  * UMS was only ever supported on pci devices.
  */
 int drm_setunique(struct drm_device *dev, void *data,
 		  struct drm_file *file_priv)
 {
 	struct drm_unique *u = data;
 	struct drm_master *master = file_priv->master;
 	int ret;

 	if (master->unique_len || master->unique)
 		return -EBUSY;

 	if (!u->unique_len || u->unique_len > 1024)
 		return -EINVAL;

 	if (drm_core_check_feature(dev, DRIVER_MODESET))
 		return 0;

 	if (WARN_ON(!dev->pdev))
 		return -EINVAL;

 	ret = drm_pci_set_unique(dev, master, u);
 	if (ret)
 		goto err;

 	return 0;

 err:
 	drm_unset_busid(dev, master);
 	return ret;
 }

 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
 {
 	struct drm_master *master = file_priv->master;
 	int ret;

 	if (master->unique != NULL)
 		drm_unset_busid(dev, master);

 	ret = dev->driver->bus->set_busid(dev, master);
 	if (ret)
 		goto err;
 	return 0;
 err:
 	drm_unset_busid(dev, master);
 	return ret;
 }

 /**
  * Get a mapping information.
  *
  * \param inode device inode.
  * \param file_priv DRM file private.
  * \param cmd command.
  * \param arg user argument, pointing to a drm_map structure.
  *
  * \return zero on success or a negative number on failure.
  *
  * Searches for the mapping with the specified offset and copies its information
  * into userspace
  */
 int drm_getmap(struct drm_device *dev, void *data,
 	       struct drm_file *file_priv)
 {
 	struct drm_map *map = data;
 	struct drm_map_list *r_list = NULL;
 	struct list_head *list;
 	int idx;
 	int i;

 	idx = map->offset;
 	if (idx < 0)
 		return -EINVAL;

 	i = 0;
 	mutex_lock(&dev->struct_mutex);
 	list_for_each(list, &dev->maplist) {
 		if (i == idx) {
 			r_list = list_entry(list, struct drm_map_list, head);
 			break;
 		}
 		i++;
 	}
 	if (!r_list || !r_list->map) {
 		mutex_unlock(&dev->struct_mutex);
 		return -EINVAL;
 	}

 	map->offset = r_list->map->offset;
 	map->size = r_list->map->size;
 	map->type = r_list->map->type;
 	map->flags = r_list->map->flags;
 	map->handle = (void *)(unsigned long) r_list->user_token;

 #ifdef CONFIG_X86
 	/*
 	 * There appears to be exactly one user of the mtrr index: dritest.
 	 * It's easy enough to keep it working on non-PAT systems.
 	 */
 	map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr);
 #else
 	map->mtrr = -1;
 #endif

 	mutex_unlock(&dev->struct_mutex);

 	return 0;
 }

 /**
  * Get client information.
  *
  * \param inode device inode.
  * \param file_priv DRM file private.
  * \param cmd command.
  * \param arg user argument, pointing to a drm_client structure.
  *
  * \return zero on success or a negative number on failure.
  *
  * Searches for the client with the specified index and copies its information
  * into userspace
  */
 int drm_getclient(struct drm_device *dev, void *data,
 		  struct drm_file *file_priv)
 {
 	struct drm_client *client = data;

 	/*
 	 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools
 	 * not breaking completely. Userspace tools stop enumerating one they
 	 * get -EINVAL, hence this is the return value we need to hand back for
 	 * no clients tracked.
 	 *
 	 * Unfortunately some clients (*cough* libva *cough*) use this in a fun
 	 * attempt to figure out whether they're authenticated or not. Since
 	 * that's the only thing they care about, give it to the directly
 	 * instead of walking one giant list.
 	 */
 	if (client->idx == 0) {
 		client->auth = file_priv->authenticated;
 		client->pid = pid_vnr(file_priv->pid);
 		client->uid = from_kuid_munged(current_user_ns(),
 					       file_priv->uid);
 		client->magic = 0;
 		client->iocs = 0;

 		return 0;
 	} else {
 		return -EINVAL;
 	}
 }

 /**
  * Get statistics information.
  *
  * \param inode device inode.
  * \param file_priv DRM file private.
  * \param cmd command.
  * \param arg user argument, pointing to a drm_stats structure.
  *
  * \return zero on success or a negative number on failure.
  */
 int drm_getstats(struct drm_device *dev, void *data,
 		 struct drm_file *file_priv)
 {
 	struct drm_stats *stats = data;

 	/* Clear stats to prevent userspace from eating its stack garbage. */
 	memset(stats, 0, sizeof(*stats));

 	return 0;
 }

 /**
  * Get device/driver capabilities
  */
 int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 {
 	struct drm_get_cap *req = data;

 	req->value = 0;
 	switch (req->capability) {
 	case DRM_CAP_DUMB_BUFFER:
 		if (dev->driver->dumb_create)
 			req->value = 1;
 		break;
 	case DRM_CAP_VBLANK_HIGH_CRTC:
 		req->value = 1;
 		break;
 	case DRM_CAP_DUMB_PREFERRED_DEPTH:
 		req->value = dev->mode_config.preferred_depth;
 		break;
 	case DRM_CAP_DUMB_PREFER_SHADOW:
 		req->value = dev->mode_config.prefer_shadow;
 		break;
 	case DRM_CAP_PRIME:
 		req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
 		req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
 		break;
 	case DRM_CAP_TIMESTAMP_MONOTONIC:
 		req->value = drm_timestamp_monotonic;
 		break;
 	case DRM_CAP_ASYNC_PAGE_FLIP:
 		req->value = dev->mode_config.async_page_flip;
 		break;
 	case DRM_CAP_CURSOR_WIDTH:
 		if (dev->mode_config.cursor_width)
 			req->value = dev->mode_config.cursor_width;
 		else
 			req->value = 64;
 		break;
 	case DRM_CAP_CURSOR_HEIGHT:
 		if (dev->mode_config.cursor_height)
 			req->value = dev->mode_config.cursor_height;
 		else
 			req->value = 64;
 		break;
 	default:
 		return -EINVAL;
 	}
 	return 0;
 }

 /**
  * Set device/driver capabilities
  */
 int
 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 {
 	struct drm_set_client_cap *req = data;

 	switch (req->capability) {
 	case DRM_CLIENT_CAP_STEREO_3D:
 		if (req->value > 1)
 			return -EINVAL;
 		file_priv->stereo_allowed = req->value;
 		break;
 	case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
 		if (!drm_universal_planes)
 			return -EINVAL;
 		if (req->value > 1)
 			return -EINVAL;
 		file_priv->universal_planes = req->value;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 /**
  * Setversion ioctl.
  *
  * \param inode device inode.
  * \param file_priv DRM file private.
  * \param cmd command.
  * \param arg user argument, pointing to a drm_lock structure.
  * \return zero on success or negative number on failure.
  *
  * Sets the requested interface version
  */
 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
 {
 	struct drm_set_version *sv = data;
 	int if_version, retcode = 0;

 	if (sv->drm_di_major != -1) {
 		if (sv->drm_di_major != DRM_IF_MAJOR ||
 		    sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
 			retcode = -EINVAL;
 			goto done;
 		}
 		if_version = DRM_IF_VERSION(sv->drm_di_major,
 					    sv->drm_di_minor);
 		dev->if_version = max(if_version, dev->if_version);
 		if (sv->drm_di_minor >= 1) {
 			/*
 			 * Version 1.1 includes tying of DRM to specific device
 			 * Version 1.4 has proper PCI domain support
 			 */
 			retcode = drm_set_busid(dev, file_priv);
 			if (retcode)
 				goto done;
 		}
 	}

 	if (sv->drm_dd_major != -1) {
 		if (sv->drm_dd_major != dev->driver->major ||
 		    sv->drm_dd_minor < 0 || sv->drm_dd_minor >
 		    dev->driver->minor) {
 			retcode = -EINVAL;
 			goto done;
 		}
 	}

 done:
 	sv->drm_di_major = DRM_IF_MAJOR;
 	sv->drm_di_minor = DRM_IF_MINOR;
 	sv->drm_dd_major = dev->driver->major;
 	sv->drm_dd_minor = dev->driver->minor;

 	return retcode;
 }

 /** No-op ioctl. */
 int drm_noop(struct drm_device *dev, void *data,
 	     struct drm_file *file_priv)
 {
 	DRM_DEBUG("\n");
 	return 0;
 }
 EXPORT_SYMBOL(drm_noop);
	/**
	* \file drm_ioctl.c
	* IOCTL processing for DRM
	*
	* \author Rickard E. (Rik) Faith <faith@valinux.com>
	* \author Gareth Hughes <gareth@valinux.com>
	*/

	/*
	* Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com
	*
	* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
	* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
	* All Rights Reserved.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice (including the next
	* paragraph) shall be included in all copies or substantial portions of the
	* Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	* OTHER DEALINGS IN THE SOFTWARE.
	*/

	#include <drm/drmP.h>
	#include <drm/drm_core.h>

	#include <linux/pci.h>
	#include <linux/export.h>
	#ifdef CONFIG_X86
	#include <asm/mtrr.h>
	#endif

	/**
	* Get the bus id.
	*
	* \param inode device inode.
	* \param file_priv DRM file private.
	* \param cmd command.
	* \param arg user argument, pointing to a drm_unique structure.
	* \return zero on success or a negative number on failure.
	*
	* Copies the bus id from drm_device::unique into user space.
	*/
	int drm_getunique(struct drm_device dev, void data,
	struct drm_file *file_priv)
	{
	struct drm_unique *u = data;
	struct drm_master *master = file_priv->master;

	if (u->unique_len >= master->unique_len) {
	if (copy_to_user(u->unique, master->unique, master->unique_len))
	return -EFAULT;
	}
	u->unique_len = master->unique_len;

	return 0;
	}

	static void
	drm_unset_busid(struct drm_device *dev,
	struct drm_master *master)
	{
	kfree(master->unique);
	master->unique = NULL;
	master->unique_len = 0;
	master->unique_size = 0;
	}

	/**
	* Set the bus id.
	*
	* \param inode device inode.
	* \param file_priv DRM file private.
	* \param cmd command.
	* \param arg user argument, pointing to a drm_unique structure.
	* \return zero on success or a negative number on failure.
	*
	* Copies the bus id from userspace into drm_device::unique, and verifies that
	* it matches the device this DRM is attached to (EINVAL otherwise). Deprecated
	* in interface version 1.1 and will return EBUSY when setversion has requested
	* version 1.1 or greater. Also note that KMS is all version 1.1 and later and
	* UMS was only ever supported on pci devices.
	*/
	int drm_setunique(struct drm_device dev, void data,
	struct drm_file *file_priv)
	{
	struct drm_unique *u = data;
	struct drm_master *master = file_priv->master;
	int ret;

	if (master->unique_len \|\| master->unique)
	return -EBUSY;

	if (!u->unique_len \|\| u->unique_len > 1024)
	return -EINVAL;

	if (drm_core_check_feature(dev, DRIVER_MODESET))
	return 0;

	if (WARN_ON(!dev->pdev))
	return -EINVAL;

	ret = drm_pci_set_unique(dev, master, u);
	if (ret)
	goto err;

	return 0;

	err:
	drm_unset_busid(dev, master);
	return ret;
	}

	static int drm_set_busid(struct drm_device dev, struct drm_file file_priv)
	{
	struct drm_master *master = file_priv->master;
	int ret;

	if (master->unique != NULL)
	drm_unset_busid(dev, master);

	ret = dev->driver->bus->set_busid(dev, master);
	if (ret)
	goto err;
	return 0;
	err:
	drm_unset_busid(dev, master);
	return ret;
	}

	/**
	* Get a mapping information.
	*
	* \param inode device inode.
	* \param file_priv DRM file private.
	* \param cmd command.
	* \param arg user argument, pointing to a drm_map structure.
	*
	* \return zero on success or a negative number on failure.
	*
	* Searches for the mapping with the specified offset and copies its information
	* into userspace
	*/
	int drm_getmap(struct drm_device dev, void data,
	struct drm_file *file_priv)
	{
	struct drm_map *map = data;
	struct drm_map_list *r_list = NULL;
	struct list_head *list;
	int idx;
	int i;

	idx = map->offset;
	if (idx < 0)
	return -EINVAL;

	i = 0;
	mutex_lock(&dev->struct_mutex);
	list_for_each(list, &dev->maplist) {
	if (i == idx) {
	r_list = list_entry(list, struct drm_map_list, head);
	break;
	}
	i++;
	}
	if (!r_list \|\| !r_list->map) {
	mutex_unlock(&dev->struct_mutex);
	return -EINVAL;
	}

	map->offset = r_list->map->offset;
	map->size = r_list->map->size;
	map->type = r_list->map->type;
	map->flags = r_list->map->flags;
	map->handle = (void *)(unsigned long) r_list->user_token;

	#ifdef CONFIG_X86
	/*
	* There appears to be exactly one user of the mtrr index: dritest.
	* It's easy enough to keep it working on non-PAT systems.
	*/
	map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr);
	#else
	map->mtrr = -1;
	#endif

	mutex_unlock(&dev->struct_mutex);

	return 0;
	}

	/**
	* Get client information.
	*
	* \param inode device inode.
	* \param file_priv DRM file private.
	* \param cmd command.
	* \param arg user argument, pointing to a drm_client structure.
	*
	* \return zero on success or a negative number on failure.
	*
	* Searches for the client with the specified index and copies its information
	* into userspace
	*/
	int drm_getclient(struct drm_device dev, void data,
	struct drm_file *file_priv)
	{
	struct drm_client *client = data;

	/*
	* Hollowed-out getclient ioctl to keep some dead old drm tests/tools
	* not breaking completely. Userspace tools stop enumerating one they
	* get -EINVAL, hence this is the return value we need to hand back for
	* no clients tracked.
	*
	* Unfortunately some clients (cough libva cough) use this in a fun
	* attempt to figure out whether they're authenticated or not. Since
	* that's the only thing they care about, give it to the directly
	* instead of walking one giant list.
	*/
	if (client->idx == 0) {
	client->auth = file_priv->authenticated;
	client->pid = pid_vnr(file_priv->pid);
	client->uid = from_kuid_munged(current_user_ns(),
	file_priv->uid);
	client->magic = 0;
	client->iocs = 0;

	return 0;
	} else {
	return -EINVAL;
	}
	}

	/**
	* Get statistics information.
	*
	* \param inode device inode.
	* \param file_priv DRM file private.
	* \param cmd command.
	* \param arg user argument, pointing to a drm_stats structure.
	*
	* \return zero on success or a negative number on failure.
	*/
	int drm_getstats(struct drm_device dev, void data,
	struct drm_file *file_priv)
	{
	struct drm_stats *stats = data;

	/* Clear stats to prevent userspace from eating its stack garbage. */
	memset(stats, 0, sizeof(*stats));

	return 0;
	}

	/**
	* Get device/driver capabilities
	*/
	int drm_getcap(struct drm_device dev, void data, struct drm_file *file_priv)
	{
	struct drm_get_cap *req = data;

	req->value = 0;
	switch (req->capability) {
	case DRM_CAP_DUMB_BUFFER:
	if (dev->driver->dumb_create)
	req->value = 1;
	break;
	case DRM_CAP_VBLANK_HIGH_CRTC:
	req->value = 1;
	break;
	case DRM_CAP_DUMB_PREFERRED_DEPTH:
	req->value = dev->mode_config.preferred_depth;
	break;
	case DRM_CAP_DUMB_PREFER_SHADOW:
	req->value = dev->mode_config.prefer_shadow;
	break;
	case DRM_CAP_PRIME:
	req->value \|= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
	req->value \|= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
	break;
	case DRM_CAP_TIMESTAMP_MONOTONIC:
	req->value = drm_timestamp_monotonic;
	break;
	case DRM_CAP_ASYNC_PAGE_FLIP:
	req->value = dev->mode_config.async_page_flip;
	break;
	case DRM_CAP_CURSOR_WIDTH:
	if (dev->mode_config.cursor_width)
	req->value = dev->mode_config.cursor_width;
	else
	req->value = 64;
	break;
	case DRM_CAP_CURSOR_HEIGHT:
	if (dev->mode_config.cursor_height)
	req->value = dev->mode_config.cursor_height;
	else
	req->value = 64;
	break;
	default:
	return -EINVAL;
	}
	return 0;
	}

	/**
	* Set device/driver capabilities
	*/
	int
	drm_setclientcap(struct drm_device dev, void data, struct drm_file *file_priv)
	{
	struct drm_set_client_cap *req = data;

	switch (req->capability) {
	case DRM_CLIENT_CAP_STEREO_3D:
	if (req->value > 1)
	return -EINVAL;
	file_priv->stereo_allowed = req->value;
	break;
	case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
	if (!drm_universal_planes)
	return -EINVAL;
	if (req->value > 1)
	return -EINVAL;
	file_priv->universal_planes = req->value;
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	/**
	* Setversion ioctl.
	*
	* \param inode device inode.
	* \param file_priv DRM file private.
	* \param cmd command.
	* \param arg user argument, pointing to a drm_lock structure.
	* \return zero on success or negative number on failure.
	*
	* Sets the requested interface version
	*/
	int drm_setversion(struct drm_device dev, void data, struct drm_file *file_priv)
	{
	struct drm_set_version *sv = data;
	int if_version, retcode = 0;

	if (sv->drm_di_major != -1) {
	if (sv->drm_di_major != DRM_IF_MAJOR \|\|
	sv->drm_di_minor < 0 \|\| sv->drm_di_minor > DRM_IF_MINOR) {
	retcode = -EINVAL;
	goto done;
	}
	if_version = DRM_IF_VERSION(sv->drm_di_major,
	sv->drm_di_minor);
	dev->if_version = max(if_version, dev->if_version);
	if (sv->drm_di_minor >= 1) {
	/*
	* Version 1.1 includes tying of DRM to specific device
	* Version 1.4 has proper PCI domain support
	*/
	retcode = drm_set_busid(dev, file_priv);
	if (retcode)
	goto done;
	}
	}

	if (sv->drm_dd_major != -1) {
	if (sv->drm_dd_major != dev->driver->major \|\|
	sv->drm_dd_minor < 0 \|\| sv->drm_dd_minor >
	dev->driver->minor) {
	retcode = -EINVAL;
	goto done;
	}
	}

	done:
	sv->drm_di_major = DRM_IF_MAJOR;
	sv->drm_di_minor = DRM_IF_MINOR;
	sv->drm_dd_major = dev->driver->major;
	sv->drm_dd_minor = dev->driver->minor;

	return retcode;
	}

	/** No-op ioctl. */
	int drm_noop(struct drm_device dev, void data,
	struct drm_file *file_priv)
	{
	DRM_DEBUG("\n");
	return 0;
	}
	EXPORT_SYMBOL(drm_noop);