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

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

 unsigned int drm_rnodes = 0;	/* 1 to enable experimental render nodes API */
 EXPORT_SYMBOL(drm_rnodes);

 unsigned int drm_vblank_offdelay = 5000;    /* Default to 5000 msecs. */
 EXPORT_SYMBOL(drm_vblank_offdelay);

 unsigned int drm_timestamp_precision = 20;  /* Default to 20 usecs. */
 EXPORT_SYMBOL(drm_timestamp_precision);

 /*
  * Default to use monotonic timestamps for wait-for-vblank and page-flip
  * complete events.
  */
 unsigned int drm_timestamp_monotonic = 1;

 MODULE_AUTHOR(CORE_AUTHOR);
 MODULE_DESCRIPTION(CORE_DESC);
 MODULE_LICENSE("GPL and additional rights");
 MODULE_PARM_DESC(debug, "Enable debug output");
 MODULE_PARM_DESC(rnodes, "Enable experimental render nodes API");
 MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs]");
 MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
 MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps");

 module_param_named(debug, drm_debug, int, 0600);
 module_param_named(rnodes, drm_rnodes, int, 0600);
 module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
 module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
 module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);

 struct idr drm_minors_idr;

 struct class *drm_class;
 struct dentry *drm_debugfs_root;

 int drm_err(const char *func, const char *format, ...)
 {
 	struct va_format vaf;
 	va_list args;
 	int r;

 	va_start(args, format);

 	vaf.fmt = format;
 	vaf.va = &args;

 	r = printk(KERN_ERR "[" DRM_NAME ":%s] *ERROR* %pV", func, &vaf);

 	va_end(args);

 	return r;
 }
 EXPORT_SYMBOL(drm_err);

 void drm_ut_debug_printk(unsigned int request_level,
 			 const char *prefix,
 			 const char *function_name,
 			 const char *format, ...)
 {
 	struct va_format vaf;
 	va_list args;

 	if (drm_debug & request_level) {
 		va_start(args, format);
 		vaf.fmt = format;
 		vaf.va = &args;

 		if (function_name)
 			printk(KERN_DEBUG "[%s:%s], %pV", prefix,
 			       function_name, &vaf);
 		else
 			printk(KERN_DEBUG "%pV", &vaf);
 		va_end(args);
 	}
 }
 EXPORT_SYMBOL(drm_ut_debug_printk);

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

 	if (type == DRM_MINOR_CONTROL) {
 		base += 64;
 		limit = base + 63;
 	} else if (type == DRM_MINOR_RENDER) {
 		base += 128;
 		limit = base + 63;
 	}

 	mutex_lock(&dev->struct_mutex);
 	ret = idr_alloc(&drm_minors_idr, NULL, base, limit, GFP_KERNEL);
 	mutex_unlock(&dev->struct_mutex);

 	return ret == -ENOSPC ? -EINVAL : ret;
 }

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

 	master = kzalloc(sizeof(*master), GFP_KERNEL);
 	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;
 }
 EXPORT_SYMBOL(drm_master_get);

 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) {
 		kfree(master->unique);
 		master->unique = NULL;
 		master->unique_len = 0;
 	}

 	kfree(dev->devname);
 	dev->devname = NULL;

 	list_for_each_entry_safe(pt, next, &master->magicfree, head) {
 		list_del(&pt->head);
 		drm_ht_remove_item(&master->magiclist, &pt->hash_item);
 		kfree(pt);
 	}

 	drm_ht_remove(&master->magiclist);

 	kfree(master);
 }

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

 int drm_setmaster_ioctl(struct drm_device *dev, void *data,
 			struct drm_file *file_priv)
 {
 	int ret = 0;

 	if (file_priv->is_master)
 		return 0;

 	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)
 		return -EINVAL;

 	mutex_lock(&dev->struct_mutex);
 	file_priv->minor->master = drm_master_get(file_priv->master);
 	file_priv->is_master = 1;
 	if (dev->driver->master_set) {
 		ret = dev->driver->master_set(dev, file_priv, false);
 		if (unlikely(ret != 0)) {
 			file_priv->is_master = 0;
 			drm_master_put(&file_priv->minor->master);
 		}
 	}
 	mutex_unlock(&dev->struct_mutex);

 	return ret;
 }

 int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
 			 struct drm_file *file_priv)
 {
 	if (!file_priv->is_master)
 		return -EINVAL;

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

 	mutex_lock(&dev->struct_mutex);
 	if (dev->driver->master_drop)
 		dev->driver->master_drop(dev, file_priv, false);
 	drm_master_put(&file_priv->minor->master);
 	file_priv->is_master = 0;
 	mutex_unlock(&dev->struct_mutex);
 	return 0;
 }

 /**
  * drm_get_minor - Allocate and register new DRM minor
  * @dev: DRM device
  * @minor: Pointer to where new minor is stored
  * @type: Type of minor
  *
  * Allocate a new minor of the given type and register it. A pointer to the new
  * minor is returned in @minor.
  * Caller must hold the global DRM mutex.
  *
  * RETURNS:
  * 0 on success, negative error code on failure.
  */
 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 defined(CONFIG_DEBUG_FS)
 	ret = drm_debugfs_init(new_minor, minor_id, drm_debugfs_root);
 	if (ret) {
 		DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
 		goto err_mem;
 	}
 #endif

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

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


 err_debugfs:
 #if defined(CONFIG_DEBUG_FS)
 	drm_debugfs_cleanup(new_minor);
 err_mem:
 #endif
 	kfree(new_minor);
 err_idr:
 	idr_remove(&drm_minors_idr, minor_id);
 	*minor = NULL;
 	return ret;
 }

 /**
  * drm_unplug_minor - Unplug DRM minor
  * @minor: Minor to unplug
  *
  * Unplugs the given DRM minor but keeps the object. So after this returns,
  * minor->dev is still valid so existing open-files can still access it to get
  * device information from their drm_file ojects.
  * If the minor is already unplugged or if @minor is NULL, nothing is done.
  * The global DRM mutex must be held by the caller.
  */
 static void drm_unplug_minor(struct drm_minor *minor)
 {
 	if (!minor || !minor->kdev)
 		return;

 #if defined(CONFIG_DEBUG_FS)
 	drm_debugfs_cleanup(minor);
 #endif

 	drm_sysfs_device_remove(minor);
 	idr_remove(&drm_minors_idr, minor->index);
 }

 /**
  * drm_put_minor - Destroy DRM minor
  * @minor: Minor to destroy
  *
  * This calls drm_unplug_minor() on the given minor and then frees it. Nothing
  * is done if @minor is NULL. It is fine to call this on already unplugged
  * minors.
  * The global DRM mutex must be held by the caller.
  */
 static void drm_put_minor(struct drm_minor *minor)
 {
 	if (!minor)
 		return;

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

 	drm_unplug_minor(minor);
 	kfree(minor);
 }

 /**
  * Called via drm_exit() at module unload time or when pci device is
  * unplugged.
  *
  * Cleans up all DRM device, calling drm_lastclose().
  *
  */
 void drm_put_dev(struct drm_device *dev)
 {
 	DRM_DEBUG("\n");

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

 	drm_dev_unregister(dev);
 	drm_dev_free(dev);
 }
 EXPORT_SYMBOL(drm_put_dev);

 void drm_unplug_dev(struct drm_device *dev)
 {
 	/* for a USB device */
 	if (drm_core_check_feature(dev, DRIVER_MODESET))
 		drm_unplug_minor(dev->control);
 	if (dev->render)
 		drm_unplug_minor(dev->render);
 	drm_unplug_minor(dev->primary);

 	mutex_lock(&drm_global_mutex);

 	drm_device_set_unplugged(dev);

 	if (dev->open_count == 0) {
 		drm_put_dev(dev);
 	}
 	mutex_unlock(&drm_global_mutex);
 }
 EXPORT_SYMBOL(drm_unplug_dev);

 /**
  * drm_dev_alloc - Allocate new drm device
  * @driver: DRM driver to allocate device for
  * @parent: Parent device object
  *
  * Allocate and initialize a new DRM device. No device registration is done.
  * Call drm_dev_register() to advertice the device to user space and register it
  * with other core subsystems.
  *
  * RETURNS:
  * Pointer to new DRM device, or NULL if out of memory.
  */
 struct drm_device *drm_dev_alloc(struct drm_driver *driver,
 				 struct device *parent)
 {
 	struct drm_device *dev;
 	int ret;

 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 	if (!dev)
 		return NULL;

 	dev->dev = parent;
 	dev->driver = driver;

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

 	spin_lock_init(&dev->count_lock);
 	spin_lock_init(&dev->event_lock);
 	mutex_init(&dev->struct_mutex);
 	mutex_init(&dev->ctxlist_mutex);

 	if (drm_ht_create(&dev->map_hash, 12))
 		goto err_free;

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

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

 	return dev;

 err_ctxbitmap:
 	drm_ctxbitmap_cleanup(dev);
 err_ht:
 	drm_ht_remove(&dev->map_hash);
 err_free:
 	kfree(dev);
 	return NULL;
 }
 EXPORT_SYMBOL(drm_dev_alloc);

 /**
  * drm_dev_free - Free DRM device
  * @dev: DRM device to free
  *
  * Free a DRM device that has previously been allocated via drm_dev_alloc().
  * You must not use kfree() instead or you will leak memory.
  *
  * This must not be called once the device got registered. Use drm_put_dev()
  * instead, which then calls drm_dev_free().
  */
 void drm_dev_free(struct drm_device *dev)
 {
 	drm_put_minor(dev->control);
 	drm_put_minor(dev->render);
 	drm_put_minor(dev->primary);

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

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

 	kfree(dev->devname);
 	kfree(dev);
 }
 EXPORT_SYMBOL(drm_dev_free);

 /**
  * drm_dev_register - Register DRM device
  * @dev: Device to register
  *
  * Register the DRM device @dev with the system, advertise device to user-space
  * and start normal device operation. @dev must be allocated via drm_dev_alloc()
  * previously.
  *
  * Never call this twice on any device!
  *
  * RETURNS:
  * 0 on success, negative error code on failure.
  */
 int drm_dev_register(struct drm_device *dev, unsigned long flags)
 {
 	int ret;

 	mutex_lock(&drm_global_mutex);

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

 	if (drm_core_check_feature(dev, DRIVER_RENDER) && drm_rnodes) {
 		ret = drm_get_minor(dev, &dev->render, DRM_MINOR_RENDER);
 		if (ret)
 			goto err_control_node;
 	}

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

 	if (dev->driver->load) {
 		ret = dev->driver->load(dev, flags);
 		if (ret)
 			goto err_primary_node;
 	}

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

 	ret = 0;
 	goto out_unlock;

 err_unload:
 	if (dev->driver->unload)
 		dev->driver->unload(dev);
 err_primary_node:
 	drm_unplug_minor(dev->primary);
 err_render_node:
 	drm_unplug_minor(dev->render);
 err_control_node:
 	drm_unplug_minor(dev->control);
 out_unlock:
 	mutex_unlock(&drm_global_mutex);
 	return ret;
 }
 EXPORT_SYMBOL(drm_dev_register);

 /**
  * drm_dev_unregister - Unregister DRM device
  * @dev: Device to unregister
  *
  * Unregister the DRM device from the system. This does the reverse of
  * drm_dev_register() but does not deallocate the device. The caller must call
  * drm_dev_free() to free all resources.
  */
 void drm_dev_unregister(struct drm_device *dev)
 {
 	struct drm_map_list *r_list, *list_temp;

 	drm_lastclose(dev);

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

 	if (dev->agp)
 		drm_pci_agp_destroy(dev);

 	drm_vblank_cleanup(dev);

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

 	drm_unplug_minor(dev->control);
 	drm_unplug_minor(dev->render);
 	drm_unplug_minor(dev->primary);
 }
 EXPORT_SYMBOL(drm_dev_unregister);
	/**
	* \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 <linux/slab.h>
	#include <drm/drmP.h>
	#include <drm/drm_core.h>

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

	unsigned int drm_rnodes = 0; /* 1 to enable experimental render nodes API */
	EXPORT_SYMBOL(drm_rnodes);

	unsigned int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */
	EXPORT_SYMBOL(drm_vblank_offdelay);

	unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */
	EXPORT_SYMBOL(drm_timestamp_precision);

	/*
	* Default to use monotonic timestamps for wait-for-vblank and page-flip
	* complete events.
	*/
	unsigned int drm_timestamp_monotonic = 1;

	MODULE_AUTHOR(CORE_AUTHOR);
	MODULE_DESCRIPTION(CORE_DESC);
	MODULE_LICENSE("GPL and additional rights");
	MODULE_PARM_DESC(debug, "Enable debug output");
	MODULE_PARM_DESC(rnodes, "Enable experimental render nodes API");
	MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs]");
	MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
	MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps");

	module_param_named(debug, drm_debug, int, 0600);
	module_param_named(rnodes, drm_rnodes, int, 0600);
	module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
	module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
	module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);

	struct idr drm_minors_idr;

	struct class *drm_class;
	struct dentry *drm_debugfs_root;

	int drm_err(const char func, const char format, ...)
	{
	struct va_format vaf;
	va_list args;
	int r;

	va_start(args, format);

	vaf.fmt = format;
	vaf.va = &args;

	r = printk(KERN_ERR "[" DRM_NAME ":%s] ERROR %pV", func, &vaf);

	va_end(args);

	return r;
	}
	EXPORT_SYMBOL(drm_err);

	void drm_ut_debug_printk(unsigned int request_level,
	const char *prefix,
	const char *function_name,
	const char *format, ...)
	{
	struct va_format vaf;
	va_list args;

	if (drm_debug & request_level) {
	va_start(args, format);
	vaf.fmt = format;
	vaf.va = &args;

	if (function_name)
	printk(KERN_DEBUG "[%s:%s], %pV", prefix,
	function_name, &vaf);
	else
	printk(KERN_DEBUG "%pV", &vaf);
	va_end(args);
	}
	}
	EXPORT_SYMBOL(drm_ut_debug_printk);

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

	if (type == DRM_MINOR_CONTROL) {
	base += 64;
	limit = base + 63;
	} else if (type == DRM_MINOR_RENDER) {
	base += 128;
	limit = base + 63;
	}

	mutex_lock(&dev->struct_mutex);
	ret = idr_alloc(&drm_minors_idr, NULL, base, limit, GFP_KERNEL);
	mutex_unlock(&dev->struct_mutex);

	return ret == -ENOSPC ? -EINVAL : ret;
	}

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

	master = kzalloc(sizeof(*master), GFP_KERNEL);
	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;
	}
	EXPORT_SYMBOL(drm_master_get);

	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) {
	kfree(master->unique);
	master->unique = NULL;
	master->unique_len = 0;
	}

	kfree(dev->devname);
	dev->devname = NULL;

	list_for_each_entry_safe(pt, next, &master->magicfree, head) {
	list_del(&pt->head);
	drm_ht_remove_item(&master->magiclist, &pt->hash_item);
	kfree(pt);
	}

	drm_ht_remove(&master->magiclist);

	kfree(master);
	}

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

	int drm_setmaster_ioctl(struct drm_device dev, void data,
	struct drm_file *file_priv)
	{
	int ret = 0;

	if (file_priv->is_master)
	return 0;

	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)
	return -EINVAL;

	mutex_lock(&dev->struct_mutex);
	file_priv->minor->master = drm_master_get(file_priv->master);
	file_priv->is_master = 1;
	if (dev->driver->master_set) {
	ret = dev->driver->master_set(dev, file_priv, false);
	if (unlikely(ret != 0)) {
	file_priv->is_master = 0;
	drm_master_put(&file_priv->minor->master);
	}
	}
	mutex_unlock(&dev->struct_mutex);

	return ret;
	}

	int drm_dropmaster_ioctl(struct drm_device dev, void data,
	struct drm_file *file_priv)
	{
	if (!file_priv->is_master)
	return -EINVAL;

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

	mutex_lock(&dev->struct_mutex);
	if (dev->driver->master_drop)
	dev->driver->master_drop(dev, file_priv, false);
	drm_master_put(&file_priv->minor->master);
	file_priv->is_master = 0;
	mutex_unlock(&dev->struct_mutex);
	return 0;
	}

	/**
	* drm_get_minor - Allocate and register new DRM minor
	* @dev: DRM device
	* @minor: Pointer to where new minor is stored
	* @type: Type of minor
	*
	* Allocate a new minor of the given type and register it. A pointer to the new
	* minor is returned in @minor.
	* Caller must hold the global DRM mutex.
	*
	* RETURNS:
	* 0 on success, negative error code on failure.
	*/
	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 defined(CONFIG_DEBUG_FS)
	ret = drm_debugfs_init(new_minor, minor_id, drm_debugfs_root);
	if (ret) {
	DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
	goto err_mem;
	}
	#endif

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

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


	err_debugfs:
	#if defined(CONFIG_DEBUG_FS)
	drm_debugfs_cleanup(new_minor);
	err_mem:
	#endif
	kfree(new_minor);
	err_idr:
	idr_remove(&drm_minors_idr, minor_id);
	*minor = NULL;
	return ret;
	}

	/**
	* drm_unplug_minor - Unplug DRM minor
	* @minor: Minor to unplug
	*
	* Unplugs the given DRM minor but keeps the object. So after this returns,
	* minor->dev is still valid so existing open-files can still access it to get
	* device information from their drm_file ojects.
	* If the minor is already unplugged or if @minor is NULL, nothing is done.
	* The global DRM mutex must be held by the caller.
	*/
	static void drm_unplug_minor(struct drm_minor *minor)
	{
	if (!minor \|\| !minor->kdev)
	return;

	#if defined(CONFIG_DEBUG_FS)
	drm_debugfs_cleanup(minor);
	#endif

	drm_sysfs_device_remove(minor);
	idr_remove(&drm_minors_idr, minor->index);
	}

	/**
	* drm_put_minor - Destroy DRM minor
	* @minor: Minor to destroy
	*
	* This calls drm_unplug_minor() on the given minor and then frees it. Nothing
	* is done if @minor is NULL. It is fine to call this on already unplugged
	* minors.
	* The global DRM mutex must be held by the caller.
	*/
	static void drm_put_minor(struct drm_minor *minor)
	{
	if (!minor)
	return;

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

	drm_unplug_minor(minor);
	kfree(minor);
	}

	/**
	* Called via drm_exit() at module unload time or when pci device is
	* unplugged.
	*
	* Cleans up all DRM device, calling drm_lastclose().
	*
	*/
	void drm_put_dev(struct drm_device *dev)
	{
	DRM_DEBUG("\n");

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

	drm_dev_unregister(dev);
	drm_dev_free(dev);
	}
	EXPORT_SYMBOL(drm_put_dev);

	void drm_unplug_dev(struct drm_device *dev)
	{
	/* for a USB device */
	if (drm_core_check_feature(dev, DRIVER_MODESET))
	drm_unplug_minor(dev->control);
	if (dev->render)
	drm_unplug_minor(dev->render);
	drm_unplug_minor(dev->primary);

	mutex_lock(&drm_global_mutex);

	drm_device_set_unplugged(dev);

	if (dev->open_count == 0) {
	drm_put_dev(dev);
	}
	mutex_unlock(&drm_global_mutex);
	}
	EXPORT_SYMBOL(drm_unplug_dev);

	/**
	* drm_dev_alloc - Allocate new drm device
	* @driver: DRM driver to allocate device for
	* @parent: Parent device object
	*
	* Allocate and initialize a new DRM device. No device registration is done.
	* Call drm_dev_register() to advertice the device to user space and register it
	* with other core subsystems.
	*
	* RETURNS:
	* Pointer to new DRM device, or NULL if out of memory.
	*/
	struct drm_device drm_dev_alloc(struct drm_driver driver,
	struct device *parent)
	{
	struct drm_device *dev;
	int ret;

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
	return NULL;

	dev->dev = parent;
	dev->driver = driver;

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

	spin_lock_init(&dev->count_lock);
	spin_lock_init(&dev->event_lock);
	mutex_init(&dev->struct_mutex);
	mutex_init(&dev->ctxlist_mutex);

	if (drm_ht_create(&dev->map_hash, 12))
	goto err_free;

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

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

	return dev;

	err_ctxbitmap:
	drm_ctxbitmap_cleanup(dev);
	err_ht:
	drm_ht_remove(&dev->map_hash);
	err_free:
	kfree(dev);
	return NULL;
	}
	EXPORT_SYMBOL(drm_dev_alloc);

	/**
	* drm_dev_free - Free DRM device
	* @dev: DRM device to free
	*
	* Free a DRM device that has previously been allocated via drm_dev_alloc().
	* You must not use kfree() instead or you will leak memory.
	*
	* This must not be called once the device got registered. Use drm_put_dev()
	* instead, which then calls drm_dev_free().
	*/
	void drm_dev_free(struct drm_device *dev)
	{
	drm_put_minor(dev->control);
	drm_put_minor(dev->render);
	drm_put_minor(dev->primary);

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

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

	kfree(dev->devname);
	kfree(dev);
	}
	EXPORT_SYMBOL(drm_dev_free);

	/**
	* drm_dev_register - Register DRM device
	* @dev: Device to register
	*
	* Register the DRM device @dev with the system, advertise device to user-space
	* and start normal device operation. @dev must be allocated via drm_dev_alloc()
	* previously.
	*
	* Never call this twice on any device!
	*
	* RETURNS:
	* 0 on success, negative error code on failure.
	*/
	int drm_dev_register(struct drm_device *dev, unsigned long flags)
	{
	int ret;

	mutex_lock(&drm_global_mutex);

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

	if (drm_core_check_feature(dev, DRIVER_RENDER) && drm_rnodes) {
	ret = drm_get_minor(dev, &dev->render, DRM_MINOR_RENDER);
	if (ret)
	goto err_control_node;
	}

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

	if (dev->driver->load) {
	ret = dev->driver->load(dev, flags);
	if (ret)
	goto err_primary_node;
	}

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

	ret = 0;
	goto out_unlock;

	err_unload:
	if (dev->driver->unload)
	dev->driver->unload(dev);
	err_primary_node:
	drm_unplug_minor(dev->primary);
	err_render_node:
	drm_unplug_minor(dev->render);
	err_control_node:
	drm_unplug_minor(dev->control);
	out_unlock:
	mutex_unlock(&drm_global_mutex);
	return ret;
	}
	EXPORT_SYMBOL(drm_dev_register);

	/**
	* drm_dev_unregister - Unregister DRM device
	* @dev: Device to unregister
	*
	* Unregister the DRM device from the system. This does the reverse of
	* drm_dev_register() but does not deallocate the device. The caller must call
	* drm_dev_free() to free all resources.
	*/
	void drm_dev_unregister(struct drm_device *dev)
	{
	struct drm_map_list r_list, list_temp;

	drm_lastclose(dev);

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

	if (dev->agp)
	drm_pci_agp_destroy(dev);

	drm_vblank_cleanup(dev);

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

	drm_unplug_minor(dev->control);
	drm_unplug_minor(dev->render);
	drm_unplug_minor(dev->primary);
	}
	EXPORT_SYMBOL(drm_dev_unregister);