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/*

 * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org

 *

 * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California.

 * All Rights Reserved.

 *

 * Author Rickard E. (Rik) Faith 

 *

 * 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 

#include 

#include 

#include 

#include 

#include 

#include "drm_internal.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);

/* 1 to allow user space to request universal planes (experimental) */

unsigned int drm_universal_planes = 0;

EXPORT_SYMBOL(drm_universal_planes);

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);

struct idr drm_minors_idr;

void drm_err(const char *format, ...)

{

    struct va_format vaf;

    va_list args;

    va_start(args, format);

    vaf.fmt = format;

    vaf.va = &args;

    printk(KERN_ERR "[" DRM_NAME ":%pf] *ERROR* %pV",

           __builtin_return_address(0), &vaf);

    va_end(args);

}

EXPORT_SYMBOL(drm_err);

void drm_ut_debug_printk(const char *function_name, const char *format, ...)

{

	struct va_format vaf;

	va_list args;

//   if (drm_debug & request_level) {

//       if (function_name)

//           printk(KERN_DEBUG "[%s:%s], ", prefix, function_name);

//       va_start(args, format);

//       vprintk(format, args);

//       va_end(args);

//   }

}

EXPORT_SYMBOL(drm_ut_debug_printk);

#if 0

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);

	if (drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER)) {

		kfree(master);

		return NULL;

	}

	INIT_LIST_HEAD(&master->magicfree);

	master->minor = minor;

	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;

	mutex_lock(&dev->struct_mutex);

	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;

	}

	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);

	mutex_unlock(&dev->struct_mutex);

	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;

	mutex_lock(&dev->master_mutex);

	if (file_priv->is_master)

		goto out_unlock;

	if (file_priv->minor->master) {

		ret = -EINVAL;

		goto out_unlock;

	}

	if (!file_priv->master) {

		ret = -EINVAL;

		goto out_unlock;

	}

	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);

		}

	}

out_unlock:

	mutex_unlock(&dev->master_mutex);

	return ret;

}

int drm_dropmaster_ioctl(struct drm_device *dev, void *data,

			 struct drm_file *file_priv)

{

	int ret = -EINVAL;

	mutex_lock(&dev->master_mutex);

	if (!file_priv->is_master)

		goto out_unlock;

	if (!file_priv->minor->master)

		goto out_unlock;

	ret = 0;

	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;

out_unlock:

	mutex_unlock(&dev->master_mutex);

	return ret;

}

/*

 * DRM Minors

 * A DRM device can provide several char-dev interfaces on the DRM-Major. Each

 * of them is represented by a drm_minor object. Depending on the capabilities

 * of the device-driver, different interfaces are registered.

 *

 * Minors can be accessed via dev->$minor_name. This pointer is either

 * NULL or a valid drm_minor pointer and stays valid as long as the device is

 * valid. This means, DRM minors have the same life-time as the underlying

 * device. However, this doesn't mean that the minor is active. Minors are

 * registered and unregistered dynamically according to device-state.

 */

static struct drm_minor **drm_minor_get_slot(struct drm_device *dev,

					     unsigned int type)

{

	switch (type) {

	case DRM_MINOR_LEGACY:

		return &dev->primary;

	case DRM_MINOR_RENDER:

		return &dev->render;

	case DRM_MINOR_CONTROL:

		return &dev->control;

	default:

		return NULL;

	}

}

static int drm_minor_alloc(struct drm_device *dev, unsigned int type)

{

	struct drm_minor *minor;

	minor = kzalloc(sizeof(*minor), GFP_KERNEL);

	if (!minor)

		return -ENOMEM;

	minor->type = type;

	minor->dev = dev;

	*drm_minor_get_slot(dev, type) = minor;

	return 0;

}

static void drm_minor_free(struct drm_device *dev, unsigned int type)

{

	struct drm_minor **slot;

	slot = drm_minor_get_slot(dev, type);

	if (*slot) {

		drm_mode_group_destroy(&(*slot)->mode_group);

		kfree(*slot);

		*slot = NULL;

	}

}

static int drm_minor_register(struct drm_device *dev, unsigned int type)

{

	struct drm_minor *new_minor;

	unsigned long flags;

	int ret;

	int minor_id;

	DRM_DEBUG("\n");

	new_minor = *drm_minor_get_slot(dev, type);

	if (!new_minor)

		return 0;

	idr_preload(GFP_KERNEL);

	spin_lock_irqsave(&drm_minor_lock, flags);

	minor_id = idr_alloc(&drm_minors_idr,

			     NULL,

			     64 * type,

			     64 * (type + 1),

			     GFP_NOWAIT);

	spin_unlock_irqrestore(&drm_minor_lock, flags);

	idr_preload_end();

	if (minor_id < 0)

		return minor_id;

	new_minor->index = minor_id;

	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_id;

	}

	ret = drm_sysfs_device_add(new_minor);

	if (ret) {

		DRM_ERROR("DRM: Error sysfs_device_add.\n");

		goto err_debugfs;

	}

	/* replace NULL with @minor so lookups will succeed from now on */

	spin_lock_irqsave(&drm_minor_lock, flags);

	idr_replace(&drm_minors_idr, new_minor, new_minor->index);

	spin_unlock_irqrestore(&drm_minor_lock, flags);

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

	return 0;

err_debugfs:

	drm_debugfs_cleanup(new_minor);

err_id:

	spin_lock_irqsave(&drm_minor_lock, flags);

	idr_remove(&drm_minors_idr, minor_id);

	spin_unlock_irqrestore(&drm_minor_lock, flags);

	new_minor->index = 0;

	return ret;

}

static void drm_minor_unregister(struct drm_device *dev, unsigned int type)

{

	struct drm_minor *minor;

	unsigned long flags;

	minor = *drm_minor_get_slot(dev, type);

	if (!minor || !minor->kdev)

		return;

	spin_lock_irqsave(&drm_minor_lock, flags);

	idr_remove(&drm_minors_idr, minor->index);

	spin_unlock_irqrestore(&drm_minor_lock, flags);

	minor->index = 0;

	drm_debugfs_cleanup(minor);

	drm_sysfs_device_remove(minor);

}

/**

 * drm_minor_acquire - Acquire a DRM minor

 * @minor_id: Minor ID of the DRM-minor

 *

 * Looks up the given minor-ID and returns the respective DRM-minor object. The

 * refence-count of the underlying device is increased so you must release this

 * object with drm_minor_release().

 *

 * As long as you hold this minor, it is guaranteed that the object and the

 * minor->dev pointer will stay valid! However, the device may get unplugged and

 * unregistered while you hold the minor.

 *

 * Returns:

 * Pointer to minor-object with increased device-refcount, or PTR_ERR on

 * failure.

 */

struct drm_minor *drm_minor_acquire(unsigned int minor_id)

{

	struct drm_minor *minor;

	unsigned long flags;

	spin_lock_irqsave(&drm_minor_lock, flags);

	minor = idr_find(&drm_minors_idr, minor_id);

	if (minor)

		drm_dev_ref(minor->dev);

	spin_unlock_irqrestore(&drm_minor_lock, flags);

	if (!minor) {

		return ERR_PTR(-ENODEV);

	} else if (drm_device_is_unplugged(minor->dev)) {

		drm_dev_unref(minor->dev);

		return ERR_PTR(-ENODEV);

	}

	return minor;

}

/**

 * drm_minor_release - Release DRM minor

 * @minor: Pointer to DRM minor object

 *

 * Release a minor that was previously acquired via drm_minor_acquire().

 */

void drm_minor_release(struct drm_minor *minor)

{

	drm_dev_unref(minor->dev);

}

/**

 * drm_put_dev - Unregister and release a DRM device

 * @dev: DRM device

 *

 * Called at module unload time or when a PCI device is unplugged.

 *

 * Use of this function is discouraged. It will eventually go away completely.

 * Please use drm_dev_unregister() and drm_dev_unref() explicitly instead.

 *

 * 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_unref(dev);

}

EXPORT_SYMBOL(drm_put_dev);

void drm_unplug_dev(struct drm_device *dev)

{

	/* for a USB device */

	drm_minor_unregister(dev, DRM_MINOR_LEGACY);

	drm_minor_unregister(dev, DRM_MINOR_RENDER);

	drm_minor_unregister(dev, DRM_MINOR_CONTROL);

	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 internal mount

 * We want to be able to allocate our own "struct address_space" to control

 * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow

 * stand-alone address_space objects, so we need an underlying inode. As there

 * is no way to allocate an independent inode easily, we need a fake internal

 * VFS mount-point.

 *

 * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free()

 * frees it again. You are allowed to use iget() and iput() to get references to

 * the inode. But each drm_fs_inode_new() call must be paired with exactly one

 * drm_fs_inode_free() call (which does not have to be the last iput()).

 * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it

 * between multiple inode-users. You could, technically, call

 * iget() + drm_fs_inode_free() directly after alloc and sometime later do an

 * iput(), but this way you'd end up with a new vfsmount for each inode.

 */

static int drm_fs_cnt;

static struct vfsmount *drm_fs_mnt;

static const struct dentry_operations drm_fs_dops = {

	.d_dname	= simple_dname,

};

static const struct super_operations drm_fs_sops = {

	.statfs		= simple_statfs,

};

static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags,

				   const char *dev_name, void *data)

{

	return mount_pseudo(fs_type,

			    "drm:",

			    &drm_fs_sops,

			    &drm_fs_dops,

			    0x010203ff);

}

static struct file_system_type drm_fs_type = {

	.name		= "drm",

	.owner		= THIS_MODULE,

	.mount		= drm_fs_mount,

	.kill_sb	= kill_anon_super,

};

#endif

int drm_fill_in_dev(struct drm_device *dev,

			   const struct pci_device_id *ent,

			   struct drm_driver *driver)

{

	int ret;

	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->buf_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)) {

//		return -ENOMEM;

//	}

	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 0;

err_ctxbitmap:

//   drm_lastclose(dev);

	return ret;

}

EXPORT_SYMBOL(drm_fill_in_dev);

/**

 * Compute size order.  Returns the exponent of the smaller power of two which

 * is greater or equal to given number.

 *

 * \param size size.

 * \return order.

 *

 * \todo Can be made faster.

 */

int drm_order(unsigned long size)

{

    int order;

    unsigned long tmp;

    for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;

    if (size & (size - 1))

        ++order;

    return order;

}

int drm_sysfs_connector_add(struct drm_connector *connector)

{

    return 0;

}

void drm_sysfs_connector_remove(struct drm_connector *connector)

{ }

void drm_sysfs_hotplug_event(struct drm_device *dev)

{

    DRM_DEBUG("generating hotplug event\n");

}

u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder)

{

    u32 high = divisor >> 32;

    u64 quot;

    if (high == 0) {

        u32 rem32;

        quot = div_u64_rem(dividend, divisor, &rem32);

        *remainder = rem32;

    } else {

        int n = 1 + fls(high);

        quot = div_u64(dividend >> n, divisor >> n);

        if (quot != 0)

            quot--;

        *remainder = dividend - quot * divisor;

        if (*remainder >= divisor) {

            quot++;

            *remainder -= divisor;

        }

    }

    return quot;

}

u64 div64_u64(u64 dividend, u64 divisor)

{

        u32 high, d;

        high = divisor >> 32;

        if (high) {

                unsigned int shift = fls(high);

                d = divisor >> shift;

                dividend >>= shift;

        } else

                d = divisor;

        return div_u64(dividend, d);

}