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

 /**
  * \file drm_stub.h
  * Stub support
  *
  * \author Rickard E. (Rik) Faith <faith@valinux.com>
  */

 /*
  * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
  *
  * Copyright 2001 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
  * PRECISION INSIGHT 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 <linux/module.h>
 #include <linux/moduleparam.h>
 #include "drmP.h"
 #include "drm_core.h"

 unsigned int drm_debug = 0;	/* 1 to enable debug output */
 EXPORT_SYMBOL(drm_debug);

 MODULE_AUTHOR(CORE_AUTHOR);
 MODULE_DESCRIPTION(CORE_DESC);
 MODULE_LICENSE("GPL and additional rights");
 MODULE_PARM_DESC(debug, "Enable debug output");

 module_param_named(debug, drm_debug, int, 0600);

 struct idr drm_minors_idr;

 struct class *drm_class;
 struct proc_dir_entry *drm_proc_root;
 struct dentry *drm_debugfs_root;

 static int drm_minor_get_id(struct drm_device *dev, int type)
 {
 	int new_id;
 	int ret;
 	int base = 0, limit = 63;

 	if (type == DRM_MINOR_CONTROL) {
                 base += 64;
                 limit = base + 127;
         } else if (type == DRM_MINOR_RENDER) {
                 base += 128;
                 limit = base + 255;
         }

 again:
 	if (idr_pre_get(&drm_minors_idr, GFP_KERNEL) == 0) {
 		DRM_ERROR("Out of memory expanding drawable idr\n");
 		return -ENOMEM;
 	}
 	mutex_lock(&dev->struct_mutex);
 	ret = idr_get_new_above(&drm_minors_idr, NULL,
 				base, &new_id);
 	mutex_unlock(&dev->struct_mutex);
 	if (ret == -EAGAIN) {
 		goto again;
 	} else if (ret) {
 		return ret;
 	}

 	if (new_id >= limit) {
 		idr_remove(&drm_minors_idr, new_id);
 		return -EINVAL;
 	}
 	return new_id;
 }

 struct drm_master *drm_master_create(struct drm_minor *minor)
 {
 	struct drm_master *master;

 	master = drm_calloc(1, sizeof(*master), DRM_MEM_DRIVER);
 	if (!master)
 		return NULL;

 	kref_init(&master->refcount);
 	spin_lock_init(&master->lock.spinlock);
 	init_waitqueue_head(&master->lock.lock_queue);
 	drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER);
 	INIT_LIST_HEAD(&master->magicfree);
 	master->minor = minor;

 	list_add_tail(&master->head, &minor->master_list);

 	return master;
 }

 struct drm_master *drm_master_get(struct drm_master *master)
 {
 	kref_get(&master->refcount);
 	return master;
 }

 static void drm_master_destroy(struct kref *kref)
 {
 	struct drm_master *master = container_of(kref, struct drm_master, refcount);
 	struct drm_magic_entry *pt, *next;
 	struct drm_device *dev = master->minor->dev;
 	struct drm_map_list *r_list, *list_temp;

 	list_del(&master->head);

 	if (dev->driver->master_destroy)
 		dev->driver->master_destroy(dev, master);

 	list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
 		if (r_list->master == master) {
 			drm_rmmap_locked(dev, r_list->map);
 			r_list = NULL;
 		}
 	}

 	if (master->unique) {
 		drm_free(master->unique, master->unique_size, DRM_MEM_DRIVER);
 		master->unique = NULL;
 		master->unique_len = 0;
 	}

 	list_for_each_entry_safe(pt, next, &master->magicfree, head) {
 		list_del(&pt->head);
 		drm_ht_remove_item(&master->magiclist, &pt->hash_item);
 		drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
 	}

 	drm_ht_remove(&master->magiclist);

 	drm_free(master, sizeof(*master), DRM_MEM_DRIVER);
 }

 void drm_master_put(struct drm_master **master)
 {
 	kref_put(&(*master)->refcount, drm_master_destroy);
 	*master = NULL;
 }

 int drm_setmaster_ioctl(struct drm_device *dev, void *data,
 			struct drm_file *file_priv)
 {
 	if (file_priv->minor->master && file_priv->minor->master != file_priv->master)
 		return -EINVAL;

 	if (!file_priv->master)
 		return -EINVAL;

 	if (!file_priv->minor->master &&
 	    file_priv->minor->master != file_priv->master) {
 		mutex_lock(&dev->struct_mutex);
 		file_priv->minor->master = drm_master_get(file_priv->master);
 		mutex_unlock(&dev->struct_mutex);
 	}

 	return 0;
 }

 int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
 			 struct drm_file *file_priv)
 {
 	if (!file_priv->master)
 		return -EINVAL;
 	mutex_lock(&dev->struct_mutex);
 	drm_master_put(&file_priv->minor->master);
 	mutex_unlock(&dev->struct_mutex);
 	return 0;
 }

 static int drm_fill_in_dev(struct drm_device * dev, struct pci_dev *pdev,
 			   const struct pci_device_id *ent,
 			   struct drm_driver *driver)
 {
 	int retcode;

 	INIT_LIST_HEAD(&dev->filelist);
 	INIT_LIST_HEAD(&dev->ctxlist);
 	INIT_LIST_HEAD(&dev->vmalist);
 	INIT_LIST_HEAD(&dev->maplist);

 	spin_lock_init(&dev->count_lock);
 	spin_lock_init(&dev->drw_lock);
 	init_timer(&dev->timer);
 	mutex_init(&dev->struct_mutex);
 	mutex_init(&dev->ctxlist_mutex);

 	idr_init(&dev->drw_idr);

 	dev->pdev = pdev;
 	dev->pci_device = pdev->device;
 	dev->pci_vendor = pdev->vendor;

 #ifdef __alpha__
 	dev->hose = pdev->sysdata;
 #endif

 	if (drm_ht_create(&dev->map_hash, 12)) {
 		return -ENOMEM;
 	}

 	/* the DRM has 6 basic counters */
 	dev->counters = 6;
 	dev->types[0] = _DRM_STAT_LOCK;
 	dev->types[1] = _DRM_STAT_OPENS;
 	dev->types[2] = _DRM_STAT_CLOSES;
 	dev->types[3] = _DRM_STAT_IOCTLS;
 	dev->types[4] = _DRM_STAT_LOCKS;
 	dev->types[5] = _DRM_STAT_UNLOCKS;

 	dev->driver = driver;

 	if (drm_core_has_AGP(dev)) {
 		if (drm_device_is_agp(dev))
 			dev->agp = drm_agp_init(dev);
 		if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
 		    && (dev->agp == NULL)) {
 			DRM_ERROR("Cannot initialize the agpgart module.\n");
 			retcode = -EINVAL;
 			goto error_out_unreg;
 		}
 		if (drm_core_has_MTRR(dev)) {
 			if (dev->agp)
 				dev->agp->agp_mtrr =
 				    mtrr_add(dev->agp->agp_info.aper_base,
 					     dev->agp->agp_info.aper_size *
 					     1024 * 1024, MTRR_TYPE_WRCOMB, 1);
 		}
 	}


 	retcode = drm_ctxbitmap_init(dev);
 	if (retcode) {
 		DRM_ERROR("Cannot allocate memory for context bitmap.\n");
 		goto error_out_unreg;
 	}

 	if (driver->driver_features & DRIVER_GEM) {
 		retcode = drm_gem_init(dev);
 		if (retcode) {
 			DRM_ERROR("Cannot initialize graphics execution "
 				  "manager (GEM)\n");
 			goto error_out_unreg;
 		}
 	}

 	return 0;

       error_out_unreg:
 	drm_lastclose(dev);
 	return retcode;
 }


 /**
  * Get a secondary minor number.
  *
  * \param dev device data structure
  * \param sec-minor structure to hold the assigned minor
  * \return negative number on failure.
  *
  * Search an empty entry and initialize it to the given parameters, and
  * create the proc init entry via proc_init(). This routines assigns
  * minor numbers to secondary heads of multi-headed cards
  */
 static int drm_get_minor(struct drm_device *dev, struct drm_minor **minor, int type)
 {
 	struct drm_minor *new_minor;
 	int ret;
 	int minor_id;

 	DRM_DEBUG("\n");

 	minor_id = drm_minor_get_id(dev, type);
 	if (minor_id < 0)
 		return minor_id;

 	new_minor = kzalloc(sizeof(struct drm_minor), GFP_KERNEL);
 	if (!new_minor) {
 		ret = -ENOMEM;
 		goto err_idr;
 	}

 	new_minor->type = type;
 	new_minor->device = MKDEV(DRM_MAJOR, minor_id);
 	new_minor->dev = dev;
 	new_minor->index = minor_id;
 	INIT_LIST_HEAD(&new_minor->master_list);

 	idr_replace(&drm_minors_idr, new_minor, minor_id);

 	if (type == DRM_MINOR_LEGACY) {
 		ret = drm_proc_init(new_minor, minor_id, drm_proc_root);
 		if (ret) {
 			DRM_ERROR("DRM: Failed to initialize /proc/dri.\n");
 			goto err_mem;
 		}
 	} else
 		new_minor->proc_root = NULL;

 #if defined(CONFIG_DEBUG_FS)
 	ret = drm_debugfs_init(new_minor, minor_id, drm_debugfs_root);
 	if (ret) {
 		DRM_ERROR("DRM: Failed to initialize /debugfs/dri.\n");
 		goto err_g2;
 	}
 #endif

 	ret = drm_sysfs_device_add(new_minor);
 	if (ret) {
 		printk(KERN_ERR
 		       "DRM: Error sysfs_device_add.\n");
 		goto err_g2;
 	}
 	*minor = new_minor;

 	DRM_DEBUG("new minor assigned %d\n", minor_id);
 	return 0;


 err_g2:
 	if (new_minor->type == DRM_MINOR_LEGACY)
 		drm_proc_cleanup(new_minor, drm_proc_root);
 err_mem:
 	kfree(new_minor);
 err_idr:
 	idr_remove(&drm_minors_idr, minor_id);
 	*minor = NULL;
 	return ret;
 }

 /**
  * Register.
  *
  * \param pdev - PCI device structure
  * \param ent entry from the PCI ID table with device type flags
  * \return zero on success or a negative number on failure.
  *
  * Attempt to gets inter module "drm" information. If we are first
  * then register the character device and inter module information.
  * Try and register, if we fail to register, backout previous work.
  */
 int drm_get_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 		struct drm_driver *driver)
 {
 	struct drm_device *dev;
 	int ret;

 	DRM_DEBUG("\n");

 	dev = drm_calloc(1, sizeof(*dev), DRM_MEM_STUB);
 	if (!dev)
 		return -ENOMEM;

 	ret = pci_enable_device(pdev);
 	if (ret)
 		goto err_g1;

 	pci_set_master(pdev);
 	if ((ret = drm_fill_in_dev(dev, pdev, ent, driver))) {
 		printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
 		goto err_g2;
 	}

 	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 		pci_set_drvdata(pdev, dev);
 		ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
 		if (ret)
 			goto err_g2;
 	}

 	if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
 		goto err_g3;

 	if (dev->driver->load) {
 		ret = dev->driver->load(dev, ent->driver_data);
 		if (ret)
 			goto err_g3;
 	}

         /* setup the grouping for the legacy output */
 	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 		ret = drm_mode_group_init_legacy_group(dev, &dev->primary->mode_group);
 		if (ret)
 			goto err_g3;
 	}

 	list_add_tail(&dev->driver_item, &driver->device_list);

 	DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
 		 driver->name, driver->major, driver->minor, driver->patchlevel,
 		 driver->date, pci_name(pdev), dev->primary->index);

 	return 0;

 err_g3:
 	drm_put_minor(&dev->primary);
 err_g2:
 	pci_disable_device(pdev);
 err_g1:
 	drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 	return ret;
 }
 EXPORT_SYMBOL(drm_get_dev);

 /**
  * Put a secondary minor number.
  *
  * \param sec_minor - structure to be released
  * \return always zero
  *
  * Cleans up the proc resources. Not legal for this to be the
  * last minor released.
  *
  */
 int drm_put_minor(struct drm_minor **minor_p)
 {
 	struct drm_minor *minor = *minor_p;

 	DRM_DEBUG("release secondary minor %d\n", minor->index);

 	if (minor->type == DRM_MINOR_LEGACY)
 		drm_proc_cleanup(minor, drm_proc_root);
 #if defined(CONFIG_DEBUG_FS)
 	drm_debugfs_cleanup(minor);
 #endif

 	drm_sysfs_device_remove(minor);

 	idr_remove(&drm_minors_idr, minor->index);

 	kfree(minor);
 	*minor_p = NULL;
 	return 0;
 }

 /**
  * Called via drm_exit() at module unload time or when pci device is
  * unplugged.
  *
  * Cleans up all DRM device, calling drm_lastclose().
  *
  * \sa drm_init
  */
 void drm_put_dev(struct drm_device *dev)
 {
 	struct drm_driver *driver = dev->driver;
 	struct drm_map_list *r_list, *list_temp;

 	DRM_DEBUG("\n");

 	if (!dev) {
 		DRM_ERROR("cleanup called no dev\n");
 		return;
 	}

 	drm_vblank_cleanup(dev);

 	drm_lastclose(dev);

 	if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) &&
 	    dev->agp && dev->agp->agp_mtrr >= 0) {
 		int retval;
 		retval = mtrr_del(dev->agp->agp_mtrr,
 				  dev->agp->agp_info.aper_base,
 				  dev->agp->agp_info.aper_size * 1024 * 1024);
 		DRM_DEBUG("mtrr_del=%d\n", retval);
 	}

 	if (dev->driver->unload)
 		dev->driver->unload(dev);

 	if (drm_core_has_AGP(dev) && dev->agp) {
 		drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
 		dev->agp = NULL;
 	}

 	drm_ht_remove(&dev->map_hash);
 	drm_ctxbitmap_cleanup(dev);

 	list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
 		drm_rmmap(dev, r_list->map);

 	if (drm_core_check_feature(dev, DRIVER_MODESET))
 		drm_put_minor(&dev->control);

 	if (driver->driver_features & DRIVER_GEM)
 		drm_gem_destroy(dev);

 	drm_put_minor(&dev->primary);

 	if (dev->devname) {
 		drm_free(dev->devname, strlen(dev->devname) + 1,
 			 DRM_MEM_DRIVER);
 		dev->devname = NULL;
 	}
 	drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 }
 EXPORT_SYMBOL(drm_put_dev);
	/**
	* \file drm_stub.h
	* Stub support
	*
	* \author Rickard E. (Rik) Faith <faith@valinux.com>
	*/

	/*
	* Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
	*
	* Copyright 2001 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
	* PRECISION INSIGHT 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 <linux/module.h>
	#include <linux/moduleparam.h>
	#include "drmP.h"
	#include "drm_core.h"

	unsigned int drm_debug = 0; /* 1 to enable debug output */
	EXPORT_SYMBOL(drm_debug);

	MODULE_AUTHOR(CORE_AUTHOR);
	MODULE_DESCRIPTION(CORE_DESC);
	MODULE_LICENSE("GPL and additional rights");
	MODULE_PARM_DESC(debug, "Enable debug output");

	module_param_named(debug, drm_debug, int, 0600);

	struct idr drm_minors_idr;

	struct class *drm_class;
	struct proc_dir_entry *drm_proc_root;
	struct dentry *drm_debugfs_root;

	static int drm_minor_get_id(struct drm_device *dev, int type)
	{
	int new_id;
	int ret;
	int base = 0, limit = 63;

	if (type == DRM_MINOR_CONTROL) {
	base += 64;
	limit = base + 127;
	} else if (type == DRM_MINOR_RENDER) {
	base += 128;
	limit = base + 255;
	}

	again:
	if (idr_pre_get(&drm_minors_idr, GFP_KERNEL) == 0) {
	DRM_ERROR("Out of memory expanding drawable idr\n");
	return -ENOMEM;
	}
	mutex_lock(&dev->struct_mutex);
	ret = idr_get_new_above(&drm_minors_idr, NULL,
	base, &new_id);
	mutex_unlock(&dev->struct_mutex);
	if (ret == -EAGAIN) {
	goto again;
	} else if (ret) {
	return ret;
	}

	if (new_id >= limit) {
	idr_remove(&drm_minors_idr, new_id);
	return -EINVAL;
	}
	return new_id;
	}

	struct drm_master drm_master_create(struct drm_minor minor)
	{
	struct drm_master *master;

	master = drm_calloc(1, sizeof(*master), DRM_MEM_DRIVER);
	if (!master)
	return NULL;

	kref_init(&master->refcount);
	spin_lock_init(&master->lock.spinlock);
	init_waitqueue_head(&master->lock.lock_queue);
	drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER);
	INIT_LIST_HEAD(&master->magicfree);
	master->minor = minor;

	list_add_tail(&master->head, &minor->master_list);

	return master;
	}

	struct drm_master drm_master_get(struct drm_master master)
	{
	kref_get(&master->refcount);
	return master;
	}

	static void drm_master_destroy(struct kref *kref)
	{
	struct drm_master *master = container_of(kref, struct drm_master, refcount);
	struct drm_magic_entry pt, next;
	struct drm_device *dev = master->minor->dev;
	struct drm_map_list r_list, list_temp;

	list_del(&master->head);

	if (dev->driver->master_destroy)
	dev->driver->master_destroy(dev, master);

	list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
	if (r_list->master == master) {
	drm_rmmap_locked(dev, r_list->map);
	r_list = NULL;
	}
	}

	if (master->unique) {
	drm_free(master->unique, master->unique_size, DRM_MEM_DRIVER);
	master->unique = NULL;
	master->unique_len = 0;
	}

	list_for_each_entry_safe(pt, next, &master->magicfree, head) {
	list_del(&pt->head);
	drm_ht_remove_item(&master->magiclist, &pt->hash_item);
	drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
	}

	drm_ht_remove(&master->magiclist);

	drm_free(master, sizeof(*master), DRM_MEM_DRIVER);
	}

	void drm_master_put(struct drm_master **master)
	{
	kref_put(&(*master)->refcount, drm_master_destroy);
	*master = NULL;
	}

	int drm_setmaster_ioctl(struct drm_device dev, void data,
	struct drm_file *file_priv)
	{
	if (file_priv->minor->master && file_priv->minor->master != file_priv->master)
	return -EINVAL;

	if (!file_priv->master)
	return -EINVAL;

	if (!file_priv->minor->master &&
	file_priv->minor->master != file_priv->master) {
	mutex_lock(&dev->struct_mutex);
	file_priv->minor->master = drm_master_get(file_priv->master);
	mutex_unlock(&dev->struct_mutex);
	}

	return 0;
	}

	int drm_dropmaster_ioctl(struct drm_device dev, void data,
	struct drm_file *file_priv)
	{
	if (!file_priv->master)
	return -EINVAL;
	mutex_lock(&dev->struct_mutex);
	drm_master_put(&file_priv->minor->master);
	mutex_unlock(&dev->struct_mutex);
	return 0;
	}

	static int drm_fill_in_dev(struct drm_device * dev, struct pci_dev *pdev,
	const struct pci_device_id *ent,
	struct drm_driver *driver)
	{
	int retcode;

	INIT_LIST_HEAD(&dev->filelist);
	INIT_LIST_HEAD(&dev->ctxlist);
	INIT_LIST_HEAD(&dev->vmalist);
	INIT_LIST_HEAD(&dev->maplist);

	spin_lock_init(&dev->count_lock);
	spin_lock_init(&dev->drw_lock);
	init_timer(&dev->timer);
	mutex_init(&dev->struct_mutex);
	mutex_init(&dev->ctxlist_mutex);

	idr_init(&dev->drw_idr);

	dev->pdev = pdev;
	dev->pci_device = pdev->device;
	dev->pci_vendor = pdev->vendor;

	#ifdef __alpha__
	dev->hose = pdev->sysdata;
	#endif

	if (drm_ht_create(&dev->map_hash, 12)) {
	return -ENOMEM;
	}

	/* the DRM has 6 basic counters */
	dev->counters = 6;
	dev->types[0] = _DRM_STAT_LOCK;
	dev->types[1] = _DRM_STAT_OPENS;
	dev->types[2] = _DRM_STAT_CLOSES;
	dev->types[3] = _DRM_STAT_IOCTLS;
	dev->types[4] = _DRM_STAT_LOCKS;
	dev->types[5] = _DRM_STAT_UNLOCKS;

	dev->driver = driver;

	if (drm_core_has_AGP(dev)) {
	if (drm_device_is_agp(dev))
	dev->agp = drm_agp_init(dev);
	if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
	&& (dev->agp == NULL)) {
	DRM_ERROR("Cannot initialize the agpgart module.\n");
	retcode = -EINVAL;
	goto error_out_unreg;
	}
	if (drm_core_has_MTRR(dev)) {
	if (dev->agp)
	dev->agp->agp_mtrr =
	mtrr_add(dev->agp->agp_info.aper_base,
	dev->agp->agp_info.aper_size *
	1024 * 1024, MTRR_TYPE_WRCOMB, 1);
	}
	}


	retcode = drm_ctxbitmap_init(dev);
	if (retcode) {
	DRM_ERROR("Cannot allocate memory for context bitmap.\n");
	goto error_out_unreg;
	}

	if (driver->driver_features & DRIVER_GEM) {
	retcode = drm_gem_init(dev);
	if (retcode) {
	DRM_ERROR("Cannot initialize graphics execution "
	"manager (GEM)\n");
	goto error_out_unreg;
	}
	}

	return 0;

	error_out_unreg:
	drm_lastclose(dev);
	return retcode;
	}


	/**
	* Get a secondary minor number.
	*
	* \param dev device data structure
	* \param sec-minor structure to hold the assigned minor
	* \return negative number on failure.
	*
	* Search an empty entry and initialize it to the given parameters, and
	* create the proc init entry via proc_init(). This routines assigns
	* minor numbers to secondary heads of multi-headed cards
	*/
	static int drm_get_minor(struct drm_device dev, struct drm_minor *minor, int type)
	{
	struct drm_minor *new_minor;
	int ret;
	int minor_id;

	DRM_DEBUG("\n");

	minor_id = drm_minor_get_id(dev, type);
	if (minor_id < 0)
	return minor_id;

	new_minor = kzalloc(sizeof(struct drm_minor), GFP_KERNEL);
	if (!new_minor) {
	ret = -ENOMEM;
	goto err_idr;
	}

	new_minor->type = type;
	new_minor->device = MKDEV(DRM_MAJOR, minor_id);
	new_minor->dev = dev;
	new_minor->index = minor_id;
	INIT_LIST_HEAD(&new_minor->master_list);

	idr_replace(&drm_minors_idr, new_minor, minor_id);

	if (type == DRM_MINOR_LEGACY) {
	ret = drm_proc_init(new_minor, minor_id, drm_proc_root);
	if (ret) {
	DRM_ERROR("DRM: Failed to initialize /proc/dri.\n");
	goto err_mem;
	}
	} else
	new_minor->proc_root = NULL;

	#if defined(CONFIG_DEBUG_FS)
	ret = drm_debugfs_init(new_minor, minor_id, drm_debugfs_root);
	if (ret) {
	DRM_ERROR("DRM: Failed to initialize /debugfs/dri.\n");
	goto err_g2;
	}
	#endif

	ret = drm_sysfs_device_add(new_minor);
	if (ret) {
	printk(KERN_ERR
	"DRM: Error sysfs_device_add.\n");
	goto err_g2;
	}
	*minor = new_minor;

	DRM_DEBUG("new minor assigned %d\n", minor_id);
	return 0;


	err_g2:
	if (new_minor->type == DRM_MINOR_LEGACY)
	drm_proc_cleanup(new_minor, drm_proc_root);
	err_mem:
	kfree(new_minor);
	err_idr:
	idr_remove(&drm_minors_idr, minor_id);
	*minor = NULL;
	return ret;
	}

	/**
	* Register.
	*
	* \param pdev - PCI device structure
	* \param ent entry from the PCI ID table with device type flags
	* \return zero on success or a negative number on failure.
	*
	* Attempt to gets inter module "drm" information. If we are first
	* then register the character device and inter module information.
	* Try and register, if we fail to register, backout previous work.
	*/
	int drm_get_dev(struct pci_dev pdev, const struct pci_device_id ent,
	struct drm_driver *driver)
	{
	struct drm_device *dev;
	int ret;

	DRM_DEBUG("\n");

	dev = drm_calloc(1, sizeof(*dev), DRM_MEM_STUB);
	if (!dev)
	return -ENOMEM;

	ret = pci_enable_device(pdev);
	if (ret)
	goto err_g1;

	pci_set_master(pdev);
	if ((ret = drm_fill_in_dev(dev, pdev, ent, driver))) {
	printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
	goto err_g2;
	}

	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
	pci_set_drvdata(pdev, dev);
	ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
	if (ret)
	goto err_g2;
	}

	if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
	goto err_g3;

	if (dev->driver->load) {
	ret = dev->driver->load(dev, ent->driver_data);
	if (ret)
	goto err_g3;
	}

	/* setup the grouping for the legacy output */
	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
	ret = drm_mode_group_init_legacy_group(dev, &dev->primary->mode_group);
	if (ret)
	goto err_g3;
	}

	list_add_tail(&dev->driver_item, &driver->device_list);

	DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
	driver->name, driver->major, driver->minor, driver->patchlevel,
	driver->date, pci_name(pdev), dev->primary->index);

	return 0;

	err_g3:
	drm_put_minor(&dev->primary);
	err_g2:
	pci_disable_device(pdev);
	err_g1:
	drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
	return ret;
	}
	EXPORT_SYMBOL(drm_get_dev);

	/**
	* Put a secondary minor number.
	*
	* \param sec_minor - structure to be released
	* \return always zero
	*
	* Cleans up the proc resources. Not legal for this to be the
	* last minor released.
	*
	*/
	int drm_put_minor(struct drm_minor **minor_p)
	{
	struct drm_minor minor = minor_p;

	DRM_DEBUG("release secondary minor %d\n", minor->index);

	if (minor->type == DRM_MINOR_LEGACY)
	drm_proc_cleanup(minor, drm_proc_root);
	#if defined(CONFIG_DEBUG_FS)
	drm_debugfs_cleanup(minor);
	#endif

	drm_sysfs_device_remove(minor);

	idr_remove(&drm_minors_idr, minor->index);

	kfree(minor);
	*minor_p = NULL;
	return 0;
	}

	/**
	* Called via drm_exit() at module unload time or when pci device is
	* unplugged.
	*
	* Cleans up all DRM device, calling drm_lastclose().
	*
	* \sa drm_init
	*/
	void drm_put_dev(struct drm_device *dev)
	{
	struct drm_driver *driver = dev->driver;
	struct drm_map_list r_list, list_temp;

	DRM_DEBUG("\n");

	if (!dev) {
	DRM_ERROR("cleanup called no dev\n");
	return;
	}

	drm_vblank_cleanup(dev);

	drm_lastclose(dev);

	if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) &&
	dev->agp && dev->agp->agp_mtrr >= 0) {
	int retval;
	retval = mtrr_del(dev->agp->agp_mtrr,
	dev->agp->agp_info.aper_base,
	dev->agp->agp_info.aper_size * 1024 * 1024);
	DRM_DEBUG("mtrr_del=%d\n", retval);
	}

	if (dev->driver->unload)
	dev->driver->unload(dev);

	if (drm_core_has_AGP(dev) && dev->agp) {
	drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
	dev->agp = NULL;
	}

	drm_ht_remove(&dev->map_hash);
	drm_ctxbitmap_cleanup(dev);

	list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
	drm_rmmap(dev, r_list->map);

	if (drm_core_check_feature(dev, DRIVER_MODESET))
	drm_put_minor(&dev->control);

	if (driver->driver_features & DRIVER_GEM)
	drm_gem_destroy(dev);

	drm_put_minor(&dev->primary);

	if (dev->devname) {
	drm_free(dev->devname, strlen(dev->devname) + 1,
	DRM_MEM_DRIVER);
	dev->devname = NULL;
	}
	drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
	}
	EXPORT_SYMBOL(drm_put_dev);