drivers/char/drm/drm_ioctl.c - linux - Git at Google

 /**
  * \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 "drmP.h"
 #include "drm_core.h"

 #include "linux/pci.h"

 /**
  * Get the bus id.
  *
  * \param inode device inode.
  * \param filp file pointer.
  * \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 inode *inode, struct file *filp,
 		  unsigned int cmd, unsigned long arg)
 {
 	drm_file_t *priv = filp->private_data;
 	drm_device_t *dev = priv->head->dev;
 	struct drm_unique __user *argp = (void __user *)arg;
 	struct drm_unique u;

 	if (copy_from_user(&u, argp, sizeof(u)))
 		return -EFAULT;
 	if (u.unique_len >= dev->unique_len) {
 		if (copy_to_user(u.unique, dev->unique, dev->unique_len))
 			return -EFAULT;
 	}
 	u.unique_len = dev->unique_len;
 	if (copy_to_user(argp, &u, sizeof(u)))
 		return -EFAULT;
 	return 0;
 }

 /**
  * Set the bus id.
  *
  * \param inode device inode.
  * \param filp file pointer.
  * \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.
  */
 int drm_setunique(struct inode *inode, struct file *filp,
 		  unsigned int cmd, unsigned long arg)
 {
 	drm_file_t *priv = filp->private_data;
 	drm_device_t *dev = priv->head->dev;
 	struct drm_unique u;
 	int domain, bus, slot, func, ret;

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

 	if (copy_from_user(&u, (struct drm_unique __user *) arg, sizeof(u)))
 		return -EFAULT;

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

 	dev->unique_len = u.unique_len;
 	dev->unique = drm_alloc(u.unique_len + 1, DRM_MEM_DRIVER);
 	if (!dev->unique)
 		return -ENOMEM;
 	if (copy_from_user(dev->unique, u.unique, dev->unique_len))
 		return -EFAULT;

 	dev->unique[dev->unique_len] = '\0';

 	dev->devname =
 	    drm_alloc(strlen(dev->driver->pci_driver.name) +
 		      strlen(dev->unique) + 2, DRM_MEM_DRIVER);
 	if (!dev->devname)
 		return -ENOMEM;

 	sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
 		dev->unique);

 	/* Return error if the busid submitted doesn't match the device's actual
 	 * busid.
 	 */
 	ret = sscanf(dev->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
 	if (ret != 3)
 		return DRM_ERR(EINVAL);
 	domain = bus >> 8;
 	bus &= 0xff;

 	if ((domain != drm_get_pci_domain(dev)) ||
 	    (bus != dev->pdev->bus->number) ||
 	    (slot != PCI_SLOT(dev->pdev->devfn)) ||
 	    (func != PCI_FUNC(dev->pdev->devfn)))
 		return -EINVAL;

 	return 0;
 }

 static int drm_set_busid(drm_device_t * dev)
 {
 	int len;

 	if (dev->unique != NULL)
 		return 0;

 	dev->unique_len = 40;
 	dev->unique = drm_alloc(dev->unique_len + 1, DRM_MEM_DRIVER);
 	if (dev->unique == NULL)
 		return -ENOMEM;

 	len = snprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%d",
 		       drm_get_pci_domain(dev), dev->pdev->bus->number,
 		       PCI_SLOT(dev->pdev->devfn),
 		       PCI_FUNC(dev->pdev->devfn));

 	if (len > dev->unique_len)
 		DRM_ERROR("Unique buffer overflowed\n");

 	dev->devname =
 	    drm_alloc(strlen(dev->driver->pci_driver.name) + dev->unique_len +
 		      2, DRM_MEM_DRIVER);
 	if (dev->devname == NULL)
 		return -ENOMEM;

 	sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
 		dev->unique);

 	return 0;
 }

 /**
  * Get a mapping information.
  *
  * \param inode device inode.
  * \param filp file pointer.
  * \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 inode *inode, struct file *filp,
 	       unsigned int cmd, unsigned long arg)
 {
 	drm_file_t *priv = filp->private_data;
 	drm_device_t *dev = priv->head->dev;
 	struct drm_map __user *argp = (void __user *)arg;
 	struct drm_map map;
 	drm_map_list_t *r_list = NULL;
 	struct list_head *list;
 	int idx;
 	int i;

 	if (copy_from_user(&map, argp, sizeof(map)))
 		return -EFAULT;
 	idx = map.offset;

 	mutex_lock(&dev->struct_mutex);
 	if (idx < 0) {
 		mutex_unlock(&dev->struct_mutex);
 		return -EINVAL;
 	}

 	i = 0;
 	list_for_each(list, &dev->maplist) {
 		if (i == idx) {
 			r_list = list_entry(list, drm_map_list_t, 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;
 	map.mtrr = r_list->map->mtrr;
 	mutex_unlock(&dev->struct_mutex);

 	if (copy_to_user(argp, &map, sizeof(map)))
 		return -EFAULT;
 	return 0;
 }

 /**
  * Get client information.
  *
  * \param inode device inode.
  * \param filp file pointer.
  * \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 inode *inode, struct file *filp,
 		  unsigned int cmd, unsigned long arg)
 {
 	drm_file_t *priv = filp->private_data;
 	drm_device_t *dev = priv->head->dev;
 	struct drm_client __user *argp = (struct drm_client __user *)arg;
 	struct drm_client client;
 	drm_file_t *pt;
 	int idx;
 	int i;

 	if (copy_from_user(&client, argp, sizeof(client)))
 		return -EFAULT;
 	idx = client.idx;
 	mutex_lock(&dev->struct_mutex);

 	if (list_empty(&dev->filelist)) {
 		mutex_unlock(&dev->struct_mutex);
 		return -EINVAL;
 	}

 	i = 0;
 	list_for_each_entry(pt, &dev->filelist, lhead) {
 		if (i++ >= idx)
 			break;
 	}

 	client.auth = pt->authenticated;
 	client.pid = pt->pid;
 	client.uid = pt->uid;
 	client.magic = pt->magic;
 	client.iocs = pt->ioctl_count;
 	mutex_unlock(&dev->struct_mutex);

 	if (copy_to_user(argp, &client, sizeof(client)))
 		return -EFAULT;
 	return 0;
 }

 /**
  * Get statistics information.
  *
  * \param inode device inode.
  * \param filp file pointer.
  * \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 inode *inode, struct file *filp,
 		 unsigned int cmd, unsigned long arg)
 {
 	drm_file_t *priv = filp->private_data;
 	drm_device_t *dev = priv->head->dev;
 	struct drm_stats stats;
 	int i;

 	memset(&stats, 0, sizeof(stats));

 	mutex_lock(&dev->struct_mutex);

 	for (i = 0; i < dev->counters; i++) {
 		if (dev->types[i] == _DRM_STAT_LOCK)
 			stats.data[i].value
 			    = (dev->lock.hw_lock ? dev->lock.hw_lock->lock : 0);
 		else
 			stats.data[i].value = atomic_read(&dev->counts[i]);
 		stats.data[i].type = dev->types[i];
 	}

 	stats.count = dev->counters;

 	mutex_unlock(&dev->struct_mutex);

 	if (copy_to_user((struct drm_stats __user *) arg, &stats, sizeof(stats)))
 		return -EFAULT;
 	return 0;
 }

 /**
  * Setversion ioctl.
  *
  * \param inode device inode.
  * \param filp file pointer.
  * \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(DRM_IOCTL_ARGS)
 {
 	DRM_DEVICE;
 	struct drm_set_version sv;
 	struct drm_set_version retv;
 	int if_version;
 	struct drm_set_version __user *argp = (void __user *)data;
 	int ret;

 	if (copy_from_user(&sv, argp, sizeof(sv)))
 		return -EFAULT;

 	retv.drm_di_major = DRM_IF_MAJOR;
 	retv.drm_di_minor = DRM_IF_MINOR;
 	retv.drm_dd_major = dev->driver->major;
 	retv.drm_dd_minor = dev->driver->minor;

 	if (copy_to_user(argp, &retv, sizeof(retv)))
 		return -EFAULT;

 	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)
 			return -EINVAL;
 		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
 			 */
 			ret = drm_set_busid(dev);
 			if (ret)
 				return ret;
 		}
 	}

 	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)
 			return -EINVAL;

 		if (dev->driver->set_version)
 			dev->driver->set_version(dev, &sv);
 	}
 	return 0;
 }

 /** No-op ioctl. */
 int drm_noop(struct inode *inode, struct file *filp, unsigned int cmd,
 	     unsigned long arg)
 {
 	DRM_DEBUG("\n");
 	return 0;
 }
	/**
	* \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 "drmP.h"
	#include "drm_core.h"

	#include "linux/pci.h"

	/**
	* Get the bus id.
	*
	* \param inode device inode.
	* \param filp file pointer.
	* \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 inode inode, struct file filp,
	unsigned int cmd, unsigned long arg)
	{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	struct drm_unique __user argp = (void __user )arg;
	struct drm_unique u;

	if (copy_from_user(&u, argp, sizeof(u)))
	return -EFAULT;
	if (u.unique_len >= dev->unique_len) {
	if (copy_to_user(u.unique, dev->unique, dev->unique_len))
	return -EFAULT;
	}
	u.unique_len = dev->unique_len;
	if (copy_to_user(argp, &u, sizeof(u)))
	return -EFAULT;
	return 0;
	}

	/**
	* Set the bus id.
	*
	* \param inode device inode.
	* \param filp file pointer.
	* \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.
	*/
	int drm_setunique(struct inode inode, struct file filp,
	unsigned int cmd, unsigned long arg)
	{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	struct drm_unique u;
	int domain, bus, slot, func, ret;

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

	if (copy_from_user(&u, (struct drm_unique __user *) arg, sizeof(u)))
	return -EFAULT;

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

	dev->unique_len = u.unique_len;
	dev->unique = drm_alloc(u.unique_len + 1, DRM_MEM_DRIVER);
	if (!dev->unique)
	return -ENOMEM;
	if (copy_from_user(dev->unique, u.unique, dev->unique_len))
	return -EFAULT;

	dev->unique[dev->unique_len] = '\0';

	dev->devname =
	drm_alloc(strlen(dev->driver->pci_driver.name) +
	strlen(dev->unique) + 2, DRM_MEM_DRIVER);
	if (!dev->devname)
	return -ENOMEM;

	sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
	dev->unique);

	/* Return error if the busid submitted doesn't match the device's actual
	* busid.
	*/
	ret = sscanf(dev->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
	if (ret != 3)
	return DRM_ERR(EINVAL);
	domain = bus >> 8;
	bus &= 0xff;

	if ((domain != drm_get_pci_domain(dev)) \|\|
	(bus != dev->pdev->bus->number) \|\|
	(slot != PCI_SLOT(dev->pdev->devfn)) \|\|
	(func != PCI_FUNC(dev->pdev->devfn)))
	return -EINVAL;

	return 0;
	}

	static int drm_set_busid(drm_device_t * dev)
	{
	int len;

	if (dev->unique != NULL)
	return 0;

	dev->unique_len = 40;
	dev->unique = drm_alloc(dev->unique_len + 1, DRM_MEM_DRIVER);
	if (dev->unique == NULL)
	return -ENOMEM;

	len = snprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%d",
	drm_get_pci_domain(dev), dev->pdev->bus->number,
	PCI_SLOT(dev->pdev->devfn),
	PCI_FUNC(dev->pdev->devfn));

	if (len > dev->unique_len)
	DRM_ERROR("Unique buffer overflowed\n");

	dev->devname =
	drm_alloc(strlen(dev->driver->pci_driver.name) + dev->unique_len +
	2, DRM_MEM_DRIVER);
	if (dev->devname == NULL)
	return -ENOMEM;

	sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
	dev->unique);

	return 0;
	}

	/**
	* Get a mapping information.
	*
	* \param inode device inode.
	* \param filp file pointer.
	* \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 inode inode, struct file filp,
	unsigned int cmd, unsigned long arg)
	{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	struct drm_map __user argp = (void __user )arg;
	struct drm_map map;
	drm_map_list_t *r_list = NULL;
	struct list_head *list;
	int idx;
	int i;

	if (copy_from_user(&map, argp, sizeof(map)))
	return -EFAULT;
	idx = map.offset;

	mutex_lock(&dev->struct_mutex);
	if (idx < 0) {
	mutex_unlock(&dev->struct_mutex);
	return -EINVAL;
	}

	i = 0;
	list_for_each(list, &dev->maplist) {
	if (i == idx) {
	r_list = list_entry(list, drm_map_list_t, 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;
	map.mtrr = r_list->map->mtrr;
	mutex_unlock(&dev->struct_mutex);

	if (copy_to_user(argp, &map, sizeof(map)))
	return -EFAULT;
	return 0;
	}

	/**
	* Get client information.
	*
	* \param inode device inode.
	* \param filp file pointer.
	* \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 inode inode, struct file filp,
	unsigned int cmd, unsigned long arg)
	{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	struct drm_client __user argp = (struct drm_client __user )arg;
	struct drm_client client;
	drm_file_t *pt;
	int idx;
	int i;

	if (copy_from_user(&client, argp, sizeof(client)))
	return -EFAULT;
	idx = client.idx;
	mutex_lock(&dev->struct_mutex);

	if (list_empty(&dev->filelist)) {
	mutex_unlock(&dev->struct_mutex);
	return -EINVAL;
	}

	i = 0;
	list_for_each_entry(pt, &dev->filelist, lhead) {
	if (i++ >= idx)
	break;
	}

	client.auth = pt->authenticated;
	client.pid = pt->pid;
	client.uid = pt->uid;
	client.magic = pt->magic;
	client.iocs = pt->ioctl_count;
	mutex_unlock(&dev->struct_mutex);

	if (copy_to_user(argp, &client, sizeof(client)))
	return -EFAULT;
	return 0;
	}

	/**
	* Get statistics information.
	*
	* \param inode device inode.
	* \param filp file pointer.
	* \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 inode inode, struct file filp,
	unsigned int cmd, unsigned long arg)
	{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	struct drm_stats stats;
	int i;

	memset(&stats, 0, sizeof(stats));

	mutex_lock(&dev->struct_mutex);

	for (i = 0; i < dev->counters; i++) {
	if (dev->types[i] == _DRM_STAT_LOCK)
	stats.data[i].value
	= (dev->lock.hw_lock ? dev->lock.hw_lock->lock : 0);
	else
	stats.data[i].value = atomic_read(&dev->counts[i]);
	stats.data[i].type = dev->types[i];
	}

	stats.count = dev->counters;

	mutex_unlock(&dev->struct_mutex);

	if (copy_to_user((struct drm_stats __user *) arg, &stats, sizeof(stats)))
	return -EFAULT;
	return 0;
	}

	/**
	* Setversion ioctl.
	*
	* \param inode device inode.
	* \param filp file pointer.
	* \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(DRM_IOCTL_ARGS)
	{
	DRM_DEVICE;
	struct drm_set_version sv;
	struct drm_set_version retv;
	int if_version;
	struct drm_set_version __user argp = (void __user )data;
	int ret;

	if (copy_from_user(&sv, argp, sizeof(sv)))
	return -EFAULT;

	retv.drm_di_major = DRM_IF_MAJOR;
	retv.drm_di_minor = DRM_IF_MINOR;
	retv.drm_dd_major = dev->driver->major;
	retv.drm_dd_minor = dev->driver->minor;

	if (copy_to_user(argp, &retv, sizeof(retv)))
	return -EFAULT;

	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)
	return -EINVAL;
	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
	*/
	ret = drm_set_busid(dev);
	if (ret)
	return ret;
	}
	}

	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)
	return -EINVAL;

	if (dev->driver->set_version)
	dev->driver->set_version(dev, &sv);
	}
	return 0;
	}

	/** No-op ioctl. */
	int drm_noop(struct inode inode, struct file filp, unsigned int cmd,
	unsigned long arg)
	{
	DRM_DEBUG("\n");
	return 0;
	}