[deliverable/linux.git] / drivers / gpu / drm / drm_fops.c

/**
 * \file drm_fops.c
 * File operations for DRM
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Daryll Strauss <daryll@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * Created: Mon Jan  4 08:58:31 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 <linux/poll.h>
#include <linux/slab.h>
#include <linux/module.h>

/* from BKL pushdown: note that nothing else serializes idr_find() */
DEFINE_MUTEX(drm_global_mutex);
EXPORT_SYMBOL(drm_global_mutex);

static int drm_open_helper(struct inode *inode, struct file *filp,
			   struct drm_device * dev);

static int drm_setup(struct drm_device * dev)
{
	int ret;

	if (dev->driver->firstopen &&
	    !drm_core_check_feature(dev, DRIVER_MODESET)) {
		ret = dev->driver->firstopen(dev);
		if (ret != 0)
			return ret;
	}

	ret = drm_legacy_dma_setup(dev);
	if (ret < 0)
		return ret;


	DRM_DEBUG("\n");
	return 0;
}

/**
 * Open file.
 *
 * \param inode device inode
 * \param filp file pointer.
 * \return zero on success or a negative number on failure.
 *
 * Searches the DRM device with the same minor number, calls open_helper(), and
 * increments the device open count. If the open count was previous at zero,
 * i.e., it's the first that the device is open, then calls setup().
 */
int drm_open(struct inode *inode, struct file *filp)
{
	struct drm_device *dev = NULL;
	int minor_id = iminor(inode);
	struct drm_minor *minor;
	int retcode = 0;
	int need_setup = 0;
	struct address_space *old_mapping;
	struct address_space *old_imapping;

	minor = idr_find(&drm_minors_idr, minor_id);
	if (!minor)
		return -ENODEV;

	if (!(dev = minor->dev))
		return -ENODEV;

	if (drm_device_is_unplugged(dev))
		return -ENODEV;

	if (!dev->open_count++)
		need_setup = 1;
	mutex_lock(&dev->struct_mutex);
	old_imapping = inode->i_mapping;
	old_mapping = dev->dev_mapping;
	if (old_mapping == NULL)
		dev->dev_mapping = &inode->i_data;
	/* ihold ensures nobody can remove inode with our i_data */
	ihold(container_of(dev->dev_mapping, struct inode, i_data));
	inode->i_mapping = dev->dev_mapping;
	filp->f_mapping = dev->dev_mapping;
	mutex_unlock(&dev->struct_mutex);

	retcode = drm_open_helper(inode, filp, dev);
	if (retcode)
		goto err_undo;
	atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
	if (need_setup) {
		retcode = drm_setup(dev);
		if (retcode)
			goto err_undo;
	}
	return 0;

err_undo:
	mutex_lock(&dev->struct_mutex);
	filp->f_mapping = old_imapping;
	inode->i_mapping = old_imapping;
	iput(container_of(dev->dev_mapping, struct inode, i_data));
	dev->dev_mapping = old_mapping;
	mutex_unlock(&dev->struct_mutex);
	dev->open_count--;
	return retcode;
}
EXPORT_SYMBOL(drm_open);

/**
 * File \c open operation.
 *
 * \param inode device inode.
 * \param filp file pointer.
 *
 * Puts the dev->fops corresponding to the device minor number into
 * \p filp, call the \c open method, and restore the file operations.
 */
int drm_stub_open(struct inode *inode, struct file *filp)
{
	struct drm_device *dev = NULL;
	struct drm_minor *minor;
	int minor_id = iminor(inode);
	int err = -ENODEV;
	const struct file_operations *old_fops;

	DRM_DEBUG("\n");

	mutex_lock(&drm_global_mutex);
	minor = idr_find(&drm_minors_idr, minor_id);
	if (!minor)
		goto out;

	if (!(dev = minor->dev))
		goto out;

	if (drm_device_is_unplugged(dev))
		goto out;

	old_fops = filp->f_op;
	filp->f_op = fops_get(dev->driver->fops);
	if (filp->f_op == NULL) {
		filp->f_op = old_fops;
		goto out;
	}
	if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
		fops_put(filp->f_op);
		filp->f_op = fops_get(old_fops);
	}
	fops_put(old_fops);

out:
	mutex_unlock(&drm_global_mutex);
	return err;
}

/**
 * Check whether DRI will run on this CPU.
 *
 * \return non-zero if the DRI will run on this CPU, or zero otherwise.
 */
static int drm_cpu_valid(void)
{
#if defined(__i386__)
	if (boot_cpu_data.x86 == 3)
		return 0;	/* No cmpxchg on a 386 */
#endif
#if defined(__sparc__) && !defined(__sparc_v9__)
	return 0;		/* No cmpxchg before v9 sparc. */
#endif
	return 1;
}

/**
 * Called whenever a process opens /dev/drm.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param dev device.
 * \return zero on success or a negative number on failure.
 *
 * Creates and initializes a drm_file structure for the file private data in \p
 * filp and add it into the double linked list in \p dev.
 */
static int drm_open_helper(struct inode *inode, struct file *filp,
			   struct drm_device * dev)
{
	int minor_id = iminor(inode);
	struct drm_file *priv;
	int ret;

	if (filp->f_flags & O_EXCL)
		return -EBUSY;	/* No exclusive opens */
	if (!drm_cpu_valid())
		return -EINVAL;
	if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF)
		return -EINVAL;

	DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id);

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	filp->private_data = priv;
	priv->filp = filp;
	priv->uid = current_euid();
	priv->pid = get_pid(task_pid(current));
	priv->minor = idr_find(&drm_minors_idr, minor_id);
	if (!priv->minor) {
		ret = -ENODEV;
		goto out_put_pid;
	}

	priv->ioctl_count = 0;
	/* for compatibility root is always authenticated */
	priv->authenticated = capable(CAP_SYS_ADMIN);
	priv->lock_count = 0;

	INIT_LIST_HEAD(&priv->lhead);
	INIT_LIST_HEAD(&priv->fbs);
	mutex_init(&priv->fbs_lock);
	INIT_LIST_HEAD(&priv->event_list);
	init_waitqueue_head(&priv->event_wait);
	priv->event_space = 4096; /* set aside 4k for event buffer */

	if (dev->driver->driver_features & DRIVER_GEM)
		drm_gem_open(dev, priv);

	if (drm_core_check_feature(dev, DRIVER_PRIME))
		drm_prime_init_file_private(&priv->prime);

	if (dev->driver->open) {
		ret = dev->driver->open(dev, priv);
		if (ret < 0)
			goto out_prime_destroy;
	}

	/* if there is no current master make this fd it, but do not create
	 * any master object for render clients */
	mutex_lock(&dev->struct_mutex);
	if (!priv->minor->master && !drm_is_render_client(priv)) {
		/* create a new master */
		priv->minor->master = drm_master_create(priv->minor);
		if (!priv->minor->master) {
			mutex_unlock(&dev->struct_mutex);
			ret = -ENOMEM;
			goto out_close;
		}

		priv->is_master = 1;
		/* take another reference for the copy in the local file priv */
		priv->master = drm_master_get(priv->minor->master);

		priv->authenticated = 1;

		mutex_unlock(&dev->struct_mutex);
		if (dev->driver->master_create) {
			ret = dev->driver->master_create(dev, priv->master);
			if (ret) {
				mutex_lock(&dev->struct_mutex);
				/* drop both references if this fails */
				drm_master_put(&priv->minor->master);
				drm_master_put(&priv->master);
				mutex_unlock(&dev->struct_mutex);
				goto out_close;
			}
		}
		mutex_lock(&dev->struct_mutex);
		if (dev->driver->master_set) {
			ret = dev->driver->master_set(dev, priv, true);
			if (ret) {
				/* drop both references if this fails */
				drm_master_put(&priv->minor->master);
				drm_master_put(&priv->master);
				mutex_unlock(&dev->struct_mutex);
				goto out_close;
			}
		}
	} else if (!drm_is_render_client(priv)) {
		/* get a reference to the master */
		priv->master = drm_master_get(priv->minor->master);
	}
	mutex_unlock(&dev->struct_mutex);

	mutex_lock(&dev->struct_mutex);
	list_add(&priv->lhead, &dev->filelist);
	mutex_unlock(&dev->struct_mutex);

#ifdef __alpha__
	/*
	 * Default the hose
	 */
	if (!dev->hose) {
		struct pci_dev *pci_dev;
		pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
		if (pci_dev) {
			dev->hose = pci_dev->sysdata;
			pci_dev_put(pci_dev);
		}
		if (!dev->hose) {
			struct pci_bus *b = pci_bus_b(pci_root_buses.next);
			if (b)
				dev->hose = b->sysdata;
		}
	}
#endif

	return 0;

out_close:
	if (dev->driver->postclose)
		dev->driver->postclose(dev, priv);
out_prime_destroy:
	if (drm_core_check_feature(dev, DRIVER_PRIME))
		drm_prime_destroy_file_private(&priv->prime);
	if (dev->driver->driver_features & DRIVER_GEM)
		drm_gem_release(dev, priv);
out_put_pid:
	put_pid(priv->pid);
	kfree(priv);
	filp->private_data = NULL;
	return ret;
}

static void drm_master_release(struct drm_device *dev, struct file *filp)
{
	struct drm_file *file_priv = filp->private_data;

	if (drm_i_have_hw_lock(dev, file_priv)) {
		DRM_DEBUG("File %p released, freeing lock for context %d\n",
			  filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
		drm_lock_free(&file_priv->master->lock,
			      _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
	}
}

static void drm_events_release(struct drm_file *file_priv)
{
	struct drm_device *dev = file_priv->minor->dev;
	struct drm_pending_event *e, *et;
	struct drm_pending_vblank_event *v, *vt;
	unsigned long flags;

	spin_lock_irqsave(&dev->event_lock, flags);

	/* Remove pending flips */
	list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link)
		if (v->base.file_priv == file_priv) {
			list_del(&v->base.link);
			drm_vblank_put(dev, v->pipe);
			v->base.destroy(&v->base);
		}

	/* Remove unconsumed events */
	list_for_each_entry_safe(e, et, &file_priv->event_list, link)
		e->destroy(e);

	spin_unlock_irqrestore(&dev->event_lock, flags);
}

/**
 * Release file.
 *
 * \param inode device inode
 * \param file_priv DRM file private.
 * \return zero on success or a negative number on failure.
 *
 * If the hardware lock is held then free it, and take it again for the kernel
 * context since it's necessary to reclaim buffers. Unlink the file private
 * data from its list and free it. Decreases the open count and if it reaches
 * zero calls drm_lastclose().
 */
int drm_release(struct inode *inode, struct file *filp)
{
	struct drm_file *file_priv = filp->private_data;
	struct drm_device *dev = file_priv->minor->dev;
	int retcode = 0;

	mutex_lock(&drm_global_mutex);

	DRM_DEBUG("open_count = %d\n", dev->open_count);

	if (dev->driver->preclose)
		dev->driver->preclose(dev, file_priv);

	/* ========================================================
	 * Begin inline drm_release
	 */

	DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
		  task_pid_nr(current),
		  (long)old_encode_dev(file_priv->minor->device),
		  dev->open_count);

	/* Release any auth tokens that might point to this file_priv,
	   (do that under the drm_global_mutex) */
	if (file_priv->magic)
		(void) drm_remove_magic(file_priv->master, file_priv->magic);

	/* if the master has gone away we can't do anything with the lock */
	if (file_priv->minor->master)
		drm_master_release(dev, filp);

	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
		drm_core_reclaim_buffers(dev, file_priv);

	drm_events_release(file_priv);

	if (dev->driver->driver_features & DRIVER_MODESET)
		drm_fb_release(file_priv);

	if (dev->driver->driver_features & DRIVER_GEM)
		drm_gem_release(dev, file_priv);

	drm_legacy_ctxbitmap_release(dev, file_priv);

	mutex_lock(&dev->struct_mutex);

	if (file_priv->is_master) {
		struct drm_master *master = file_priv->master;
		struct drm_file *temp;
		list_for_each_entry(temp, &dev->filelist, lhead) {
			if ((temp->master == file_priv->master) &&
			    (temp != file_priv))
				temp->authenticated = 0;
		}

		/**
		 * Since the master is disappearing, so is the
		 * possibility to lock.
		 */

		if (master->lock.hw_lock) {
			if (dev->sigdata.lock == master->lock.hw_lock)
				dev->sigdata.lock = NULL;
			master->lock.hw_lock = NULL;
			master->lock.file_priv = NULL;
			wake_up_interruptible_all(&master->lock.lock_queue);
		}

		if (file_priv->minor->master == file_priv->master) {
			/* drop the reference held my the minor */
			if (dev->driver->master_drop)
				dev->driver->master_drop(dev, file_priv, true);
			drm_master_put(&file_priv->minor->master);
		}
	}

	BUG_ON(dev->dev_mapping == NULL);
	iput(container_of(dev->dev_mapping, struct inode, i_data));

	/* drop the reference held my the file priv */
	if (file_priv->master)
		drm_master_put(&file_priv->master);
	file_priv->is_master = 0;
	list_del(&file_priv->lhead);
	mutex_unlock(&dev->struct_mutex);

	if (dev->driver->postclose)
		dev->driver->postclose(dev, file_priv);


	if (drm_core_check_feature(dev, DRIVER_PRIME))
		drm_prime_destroy_file_private(&file_priv->prime);

	put_pid(file_priv->pid);
	kfree(file_priv);

	/* ========================================================
	 * End inline drm_release
	 */

	atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
	if (!--dev->open_count) {
		if (atomic_read(&dev->ioctl_count)) {
			DRM_ERROR("Device busy: %d\n",
				  atomic_read(&dev->ioctl_count));
			retcode = -EBUSY;
		} else
			retcode = drm_lastclose(dev);
		if (drm_device_is_unplugged(dev))
			drm_put_dev(dev);
	}
	mutex_unlock(&drm_global_mutex);

	return retcode;
}
EXPORT_SYMBOL(drm_release);

static bool
drm_dequeue_event(struct drm_file *file_priv,
		  size_t total, size_t max, struct drm_pending_event **out)
{
	struct drm_device *dev = file_priv->minor->dev;
	struct drm_pending_event *e;
	unsigned long flags;
	bool ret = false;

	spin_lock_irqsave(&dev->event_lock, flags);

	*out = NULL;
	if (list_empty(&file_priv->event_list))
		goto out;
	e = list_first_entry(&file_priv->event_list,
			     struct drm_pending_event, link);
	if (e->event->length + total > max)
		goto out;

	file_priv->event_space += e->event->length;
	list_del(&e->link);
	*out = e;
	ret = true;

out:
	spin_unlock_irqrestore(&dev->event_lock, flags);
	return ret;
}

ssize_t drm_read(struct file *filp, char __user *buffer,
		 size_t count, loff_t *offset)
{
	struct drm_file *file_priv = filp->private_data;
	struct drm_pending_event *e;
	size_t total;
	ssize_t ret;

	ret = wait_event_interruptible(file_priv->event_wait,
				       !list_empty(&file_priv->event_list));
	if (ret < 0)
		return ret;

	total = 0;
	while (drm_dequeue_event(file_priv, total, count, &e)) {
		if (copy_to_user(buffer + total,
				 e->event, e->event->length)) {
			total = -EFAULT;
			break;
		}

		total += e->event->length;
		e->destroy(e);
	}

	return total;
}
EXPORT_SYMBOL(drm_read);

unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
{
	struct drm_file *file_priv = filp->private_data;
	unsigned int mask = 0;

	poll_wait(filp, &file_priv->event_wait, wait);

	if (!list_empty(&file_priv->event_list))
		mask |= POLLIN | POLLRDNORM;

	return mask;
}
EXPORT_SYMBOL(drm_poll);
Commit	Line	Data
1da177e4	1	/**
b5e89ed5	2	* \file drm_fops.c
1da177e4	3	* File operations for DRM
b5e89ed5	4	*
1da177e4 LT	5	* \author Rickard E. (Rik) Faith <faith@valinux.com>
	6	* \author Daryll Strauss <daryll@valinux.com>
	7	* \author Gareth Hughes <gareth@valinux.com>
	8	*/
	9
	10	/*
	11	* Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
	12	*
	13	* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
	14	* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
	15	* All Rights Reserved.
	16	*
	17	* Permission is hereby granted, free of charge, to any person obtaining a
	18	* copy of this software and associated documentation files (the "Software"),
	19	* to deal in the Software without restriction, including without limitation
	20	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	21	* and/or sell copies of the Software, and to permit persons to whom the
	22	* Software is furnished to do so, subject to the following conditions:
	23	*
	24	* The above copyright notice and this permission notice (including the next
	25	* paragraph) shall be included in all copies or substantial portions of the
	26	* Software.
	27	*
	28	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	29	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	30	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	31	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	32	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	33	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	34	* OTHER DEALINGS IN THE SOFTWARE.
	35	*/
	36
760285e7	37	#include <drm/drmP.h>
1da177e4	38	#include <linux/poll.h>
5a0e3ad6	39	#include <linux/slab.h>
e0cd3608	40	#include <linux/module.h>
1da177e4	41
58374713 AB	42	/* from BKL pushdown: note that nothing else serializes idr_find() */
58374713 AB	43	DEFINE_MUTEX(drm_global_mutex);
e3461a2b	44	EXPORT_SYMBOL(drm_global_mutex);
58374713	45
b5e89ed5	46	static int drm_open_helper(struct inode inode, struct file filp,
84b1fd10	47	struct drm_device * dev);
c94f7029	48
84b1fd10	49	static int drm_setup(struct drm_device * dev)
1da177e4	50	{
1da177e4 LT	51	int ret;
1da177e4 LT	52
7d14bb6b DV	53	if (dev->driver->firstopen &&
7d14bb6b DV	54	!drm_core_check_feature(dev, DRIVER_MODESET)) {
22eae947	55	ret = dev->driver->firstopen(dev);
b5e89ed5	56	if (ret != 0)
1da177e4 LT	57	return ret;
	58	}
	59
f336ab76 DV	60	ret = drm_legacy_dma_setup(dev);
	61	if (ret < 0)
	62	return ret;
1da177e4	63
1da177e4	64
b5e89ed5	65	DRM_DEBUG("\n");
1da177e4 LT	66	return 0;
	67	}
	68
	69	/**
	70	* Open file.
b5e89ed5	71	*
1da177e4 LT	72	* \param inode device inode
	73	* \param filp file pointer.
	74	* \return zero on success or a negative number on failure.
	75	*
	76	* Searches the DRM device with the same minor number, calls open_helper(), and
	77	* increments the device open count. If the open count was previous at zero,
	78	* i.e., it's the first that the device is open, then calls setup().
	79	*/
b5e89ed5	80	int drm_open(struct inode inode, struct file filp)
1da177e4	81	{
84b1fd10	82	struct drm_device *dev = NULL;
2c14f28b DA	83	int minor_id = iminor(inode);
2c14f28b DA	84	struct drm_minor *minor;
1da177e4	85	int retcode = 0;
fdb40a08 IH	86	int need_setup = 0;
fdb40a08 IH	87	struct address_space *old_mapping;
a8ec3a66	88	struct address_space *old_imapping;
1da177e4	89
2c14f28b DA	90	minor = idr_find(&drm_minors_idr, minor_id);
2c14f28b DA	91	if (!minor)
1da177e4	92	return -ENODEV;
b5e89ed5	93
2c14f28b	94	if (!(dev = minor->dev))
1da177e4	95	return -ENODEV;
b5e89ed5	96
2c07a21d DA	97	if (drm_device_is_unplugged(dev))
	98	return -ENODEV;
	99
fdb40a08 IH	100	if (!dev->open_count++)
	101	need_setup = 1;
	102	mutex_lock(&dev->struct_mutex);
a8ec3a66	103	old_imapping = inode->i_mapping;
fdb40a08 IH	104	old_mapping = dev->dev_mapping;
	105	if (old_mapping == NULL)
	106	dev->dev_mapping = &inode->i_data;
	107	/* ihold ensures nobody can remove inode with our i_data */
	108	ihold(container_of(dev->dev_mapping, struct inode, i_data));
	109	inode->i_mapping = dev->dev_mapping;
	110	filp->f_mapping = dev->dev_mapping;
	111	mutex_unlock(&dev->struct_mutex);
	112
b5e89ed5	113	retcode = drm_open_helper(inode, filp, dev);
fdb40a08 IH	114	if (retcode)
	115	goto err_undo;
	116	atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
	117	if (need_setup) {
	118	retcode = drm_setup(dev);
	119	if (retcode)
	120	goto err_undo;
f453ba04	121	}
fdb40a08	122	return 0;
a2c0a97b	123
fdb40a08 IH	124	err_undo:
fdb40a08 IH	125	mutex_lock(&dev->struct_mutex);
a8ec3a66 IH	126	filp->f_mapping = old_imapping;
a8ec3a66 IH	127	inode->i_mapping = old_imapping;
fdb40a08 IH	128	iput(container_of(dev->dev_mapping, struct inode, i_data));
	129	dev->dev_mapping = old_mapping;
	130	mutex_unlock(&dev->struct_mutex);
	131	dev->open_count--;
1da177e4 LT	132	return retcode;
	133	}
	134	EXPORT_SYMBOL(drm_open);
	135
d985c108 DA	136	/**
	137	* File \c open operation.
	138	*
	139	* \param inode device inode.
	140	* \param filp file pointer.
	141	*
	142	* Puts the dev->fops corresponding to the device minor number into
	143	* \p filp, call the \c open method, and restore the file operations.
	144	*/
	145	int drm_stub_open(struct inode inode, struct file filp)
	146	{
84b1fd10	147	struct drm_device *dev = NULL;
2c14f28b DA	148	struct drm_minor *minor;
2c14f28b DA	149	int minor_id = iminor(inode);
d985c108	150	int err = -ENODEV;
99ac48f5	151	const struct file_operations *old_fops;
d985c108 DA	152
	153	DRM_DEBUG("\n");
	154
58374713	155	mutex_lock(&drm_global_mutex);
2c14f28b DA	156	minor = idr_find(&drm_minors_idr, minor_id);
2c14f28b DA	157	if (!minor)
70ffa16e	158	goto out;
d985c108	159
2c14f28b	160	if (!(dev = minor->dev))
70ffa16e	161	goto out;
d985c108	162
2c07a21d DA	163	if (drm_device_is_unplugged(dev))
	164	goto out;
	165
d985c108	166	old_fops = filp->f_op;
e08e96de	167	filp->f_op = fops_get(dev->driver->fops);
f41ced8f LP	168	if (filp->f_op == NULL) {
	169	filp->f_op = old_fops;
	170	goto out;
	171	}
d985c108 DA	172	if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
	173	fops_put(filp->f_op);
	174	filp->f_op = fops_get(old_fops);
	175	}
	176	fops_put(old_fops);
	177
70ffa16e	178	out:
58374713	179	mutex_unlock(&drm_global_mutex);
d985c108 DA	180	return err;
	181	}
	182
	183	/**
	184	* Check whether DRI will run on this CPU.
	185	*
	186	* \return non-zero if the DRI will run on this CPU, or zero otherwise.
	187	*/
	188	static int drm_cpu_valid(void)
	189	{
	190	#if defined(__i386__)
	191	if (boot_cpu_data.x86 == 3)
	192	return 0; /* No cmpxchg on a 386 */
	193	#endif
	194	#if defined(__sparc__) && !defined(__sparc_v9__)
	195	return 0; /* No cmpxchg before v9 sparc. */
	196	#endif
	197	return 1;
	198	}
	199
	200	/**
	201	* Called whenever a process opens /dev/drm.
	202	*
	203	* \param inode device inode.
	204	* \param filp file pointer.
	205	* \param dev device.
	206	* \return zero on success or a negative number on failure.
	207	*
	208	* Creates and initializes a drm_file structure for the file private data in \p
	209	* filp and add it into the double linked list in \p dev.
	210	*/
	211	static int drm_open_helper(struct inode inode, struct file filp,
84b1fd10	212	struct drm_device * dev)
d985c108	213	{
2c14f28b	214	int minor_id = iminor(inode);
84b1fd10	215	struct drm_file *priv;
d985c108 DA	216	int ret;
	217
	218	if (filp->f_flags & O_EXCL)
	219	return -EBUSY; /* No exclusive opens */
	220	if (!drm_cpu_valid())
	221	return -EINVAL;
13bb9cc8	222	if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF)
5bcf719b	223	return -EINVAL;
d985c108	224
2c14f28b	225	DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id);
d985c108	226
6ebc22e6	227	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
d985c108 DA	228	if (!priv)
	229	return -ENOMEM;
	230
d985c108	231	filp->private_data = priv;
6c340eac	232	priv->filp = filp;
2df68b43	233	priv->uid = current_euid();
5fce5e0b	234	priv->pid = get_pid(task_pid(current));
2c14f28b	235	priv->minor = idr_find(&drm_minors_idr, minor_id);
df9b6a9c SWK	236	if (!priv->minor) {
	237	ret = -ENODEV;
	238	goto out_put_pid;
	239	}
	240
d985c108 DA	241	priv->ioctl_count = 0;
	242	/* for compatibility root is always authenticated */
	243	priv->authenticated = capable(CAP_SYS_ADMIN);
	244	priv->lock_count = 0;
	245
bd1b331f	246	INIT_LIST_HEAD(&priv->lhead);
f453ba04	247	INIT_LIST_HEAD(&priv->fbs);
4b096ac1	248	mutex_init(&priv->fbs_lock);
c9a9c5e0 KH	249	INIT_LIST_HEAD(&priv->event_list);
	250	init_waitqueue_head(&priv->event_wait);
	251	priv->event_space = 4096; /* set aside 4k for event buffer */
bd1b331f	252
673a394b EA	253	if (dev->driver->driver_features & DRIVER_GEM)
	254	drm_gem_open(dev, priv);
	255
3248877e DA	256	if (drm_core_check_feature(dev, DRIVER_PRIME))
	257	drm_prime_init_file_private(&priv->prime);
	258
d985c108 DA	259	if (dev->driver->open) {
	260	ret = dev->driver->open(dev, priv);
	261	if (ret < 0)
df9b6a9c	262	goto out_prime_destroy;
d985c108 DA	263	}
d985c108 DA	264
1793126f DH	265	/* if there is no current master make this fd it, but do not create
1793126f DH	266	* any master object for render clients */
30e2fb18	267	mutex_lock(&dev->struct_mutex);
1793126f	268	if (!priv->minor->master && !drm_is_render_client(priv)) {
7c1c2871 DA	269	/* create a new master */
	270	priv->minor->master = drm_master_create(priv->minor);
	271	if (!priv->minor->master) {
dba5ed0c	272	mutex_unlock(&dev->struct_mutex);
7c1c2871	273	ret = -ENOMEM;
df9b6a9c	274	goto out_close;
7c1c2871 DA	275	}
	276
	277	priv->is_master = 1;
	278	/* take another reference for the copy in the local file priv */
	279	priv->master = drm_master_get(priv->minor->master);
	280
	281	priv->authenticated = 1;
	282
	283	mutex_unlock(&dev->struct_mutex);
	284	if (dev->driver->master_create) {
	285	ret = dev->driver->master_create(dev, priv->master);
	286	if (ret) {
	287	mutex_lock(&dev->struct_mutex);
	288	/* drop both references if this fails */
	289	drm_master_put(&priv->minor->master);
	290	drm_master_put(&priv->master);
	291	mutex_unlock(&dev->struct_mutex);
df9b6a9c	292	goto out_close;
7c1c2871 DA	293	}
7c1c2871 DA	294	}
862302ff TH	295	mutex_lock(&dev->struct_mutex);
	296	if (dev->driver->master_set) {
	297	ret = dev->driver->master_set(dev, priv, true);
	298	if (ret) {
	299	/* drop both references if this fails */
	300	drm_master_put(&priv->minor->master);
	301	drm_master_put(&priv->master);
	302	mutex_unlock(&dev->struct_mutex);
df9b6a9c	303	goto out_close;
862302ff TH	304	}
862302ff TH	305	}
1793126f	306	} else if (!drm_is_render_client(priv)) {
7c1c2871 DA	307	/* get a reference to the master */
7c1c2871 DA	308	priv->master = drm_master_get(priv->minor->master);
7c1c2871	309	}
1793126f	310	mutex_unlock(&dev->struct_mutex);
bd1b331f	311
7c1c2871	312	mutex_lock(&dev->struct_mutex);
bd1b331f	313	list_add(&priv->lhead, &dev->filelist);
30e2fb18	314	mutex_unlock(&dev->struct_mutex);
d985c108 DA	315
	316	#ifdef __alpha__
	317	/*
	318	* Default the hose
	319	*/
	320	if (!dev->hose) {
	321	struct pci_dev *pci_dev;
	322	pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
	323	if (pci_dev) {
	324	dev->hose = pci_dev->sysdata;
	325	pci_dev_put(pci_dev);
	326	}
	327	if (!dev->hose) {
	328	struct pci_bus *b = pci_bus_b(pci_root_buses.next);
	329	if (b)
	330	dev->hose = b->sysdata;
	331	}
	332	}
	333	#endif
	334
	335	return 0;
df9b6a9c SWK	336
	337	out_close:
	338	if (dev->driver->postclose)
	339	dev->driver->postclose(dev, priv);
	340	out_prime_destroy:
	341	if (drm_core_check_feature(dev, DRIVER_PRIME))
	342	drm_prime_destroy_file_private(&priv->prime);
	343	if (dev->driver->driver_features & DRIVER_GEM)
	344	drm_gem_release(dev, priv);
	345	out_put_pid:
	346	put_pid(priv->pid);
9a298b2a	347	kfree(priv);
d985c108 DA	348	filp->private_data = NULL;
	349	return ret;
	350	}
	351
7c1c2871 DA	352	static void drm_master_release(struct drm_device dev, struct file filp)
	353	{
	354	struct drm_file *file_priv = filp->private_data;
	355
7c1c2871 DA	356	if (drm_i_have_hw_lock(dev, file_priv)) {
	357	DRM_DEBUG("File %p released, freeing lock for context %d\n",
	358	filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
	359	drm_lock_free(&file_priv->master->lock,
	360	_DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
	361	}
7c1c2871 DA	362	}
7c1c2871 DA	363
c9a9c5e0 KH	364	static void drm_events_release(struct drm_file *file_priv)
	365	{
	366	struct drm_device *dev = file_priv->minor->dev;
	367	struct drm_pending_event e, et;
	368	struct drm_pending_vblank_event v, vt;
	369	unsigned long flags;
	370
	371	spin_lock_irqsave(&dev->event_lock, flags);
	372
	373	/* Remove pending flips */
	374	list_for_each_entry_safe(v, vt, &dev->vblank_event_list, base.link)
	375	if (v->base.file_priv == file_priv) {
	376	list_del(&v->base.link);
	377	drm_vblank_put(dev, v->pipe);
	378	v->base.destroy(&v->base);
	379	}
	380
	381	/* Remove unconsumed events */
	382	list_for_each_entry_safe(e, et, &file_priv->event_list, link)
	383	e->destroy(e);
	384
	385	spin_unlock_irqrestore(&dev->event_lock, flags);
	386	}
	387
1da177e4 LT	388	/**
	389	* Release file.
	390	*
	391	* \param inode device inode
6c340eac	392	* \param file_priv DRM file private.
1da177e4 LT	393	* \return zero on success or a negative number on failure.
	394	*
	395	* If the hardware lock is held then free it, and take it again for the kernel
	396	* context since it's necessary to reclaim buffers. Unlink the file private
	397	* data from its list and free it. Decreases the open count and if it reaches
22eae947	398	* zero calls drm_lastclose().
1da177e4	399	*/
b5e89ed5	400	int drm_release(struct inode inode, struct file filp)
1da177e4	401	{
6c340eac	402	struct drm_file *file_priv = filp->private_data;
2c14f28b	403	struct drm_device *dev = file_priv->minor->dev;
1da177e4 LT	404	int retcode = 0;
1da177e4 LT	405
58374713	406	mutex_lock(&drm_global_mutex);
1da177e4	407
b5e89ed5	408	DRM_DEBUG("open_count = %d\n", dev->open_count);
1da177e4	409
22eae947	410	if (dev->driver->preclose)
6c340eac	411	dev->driver->preclose(dev, file_priv);
1da177e4 LT	412
	413	/* ========================================================
	414	* Begin inline drm_release
	415	*/
	416
b5e89ed5	417	DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
ba25f9dc	418	task_pid_nr(current),
2c14f28b	419	(long)old_encode_dev(file_priv->minor->device),
b5e89ed5 DA	420	dev->open_count);
b5e89ed5 DA	421
598781d7 TH	422	/* Release any auth tokens that might point to this file_priv,
	423	(do that under the drm_global_mutex) */
	424	if (file_priv->magic)
	425	(void) drm_remove_magic(file_priv->master, file_priv->magic);
	426
7c1c2871 DA	427	/* if the master has gone away we can't do anything with the lock */
	428	if (file_priv->minor->master)
	429	drm_master_release(dev, filp);
1da177e4	430
67cb4b4d DV	431	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
	432	drm_core_reclaim_buffers(dev, file_priv);
	433
c9a9c5e0 KH	434	drm_events_release(file_priv);
c9a9c5e0 KH	435
ea39f835 KH	436	if (dev->driver->driver_features & DRIVER_MODESET)
	437	drm_fb_release(file_priv);
	438
4e47e02d P	439	if (dev->driver->driver_features & DRIVER_GEM)
	440	drm_gem_release(dev, file_priv);
	441
7c510133	442	drm_legacy_ctxbitmap_release(dev, file_priv);
1da177e4	443
30e2fb18	444	mutex_lock(&dev->struct_mutex);
7c1c2871 DA	445
7c1c2871 DA	446	if (file_priv->is_master) {
fda714c2	447	struct drm_master *master = file_priv->master;
84b1fd10	448	struct drm_file *temp;
7c1c2871 DA	449	list_for_each_entry(temp, &dev->filelist, lhead) {
	450	if ((temp->master == file_priv->master) &&
	451	(temp != file_priv))
	452	temp->authenticated = 0;
	453	}
bd1b331f	454
fda714c2 TH	455	/**
	456	* Since the master is disappearing, so is the
	457	* possibility to lock.
	458	*/
	459
	460	if (master->lock.hw_lock) {
	461	if (dev->sigdata.lock == master->lock.hw_lock)
	462	dev->sigdata.lock = NULL;
	463	master->lock.hw_lock = NULL;
	464	master->lock.file_priv = NULL;
	465	wake_up_interruptible_all(&master->lock.lock_queue);
	466	}
	467
7c1c2871 DA	468	if (file_priv->minor->master == file_priv->master) {
7c1c2871 DA	469	/* drop the reference held my the minor */
862302ff TH	470	if (dev->driver->master_drop)
862302ff TH	471	dev->driver->master_drop(dev, file_priv, true);
7c1c2871 DA	472	drm_master_put(&file_priv->minor->master);
7c1c2871 DA	473	}
1da177e4	474	}
7c1c2871	475
949c4a34 IH	476	BUG_ON(dev->dev_mapping == NULL);
	477	iput(container_of(dev->dev_mapping, struct inode, i_data));
	478
7c1c2871	479	/* drop the reference held my the file priv */
1793126f DH	480	if (file_priv->master)
1793126f DH	481	drm_master_put(&file_priv->master);
7c1c2871	482	file_priv->is_master = 0;
6c340eac	483	list_del(&file_priv->lhead);
30e2fb18	484	mutex_unlock(&dev->struct_mutex);
b5e89ed5	485
22eae947	486	if (dev->driver->postclose)
6c340eac	487	dev->driver->postclose(dev, file_priv);
3248877e	488
319c933c	489
3248877e DA	490	if (drm_core_check_feature(dev, DRIVER_PRIME))
	491	drm_prime_destroy_file_private(&file_priv->prime);
	492
5fce5e0b	493	put_pid(file_priv->pid);
9a298b2a	494	kfree(file_priv);
1da177e4 LT	495
	496	/* ========================================================
	497	* End inline drm_release
	498	*/
	499
b5e89ed5	500	atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
b5e89ed5	501	if (!--dev->open_count) {
7c1c2871 DA	502	if (atomic_read(&dev->ioctl_count)) {
	503	DRM_ERROR("Device busy: %d\n",
	504	atomic_read(&dev->ioctl_count));
58374713	505	retcode = -EBUSY;
1a72d65d CW	506	} else
1a72d65d CW	507	retcode = drm_lastclose(dev);
2c07a21d DA	508	if (drm_device_is_unplugged(dev))
2c07a21d DA	509	drm_put_dev(dev);
1da177e4	510	}
58374713	511	mutex_unlock(&drm_global_mutex);
1da177e4 LT	512
	513	return retcode;
	514	}
	515	EXPORT_SYMBOL(drm_release);
	516
c9a9c5e0 KH	517	static bool
	518	drm_dequeue_event(struct drm_file *file_priv,
	519	size_t total, size_t max, struct drm_pending_event **out)
	520	{
	521	struct drm_device *dev = file_priv->minor->dev;
	522	struct drm_pending_event *e;
	523	unsigned long flags;
	524	bool ret = false;
	525
	526	spin_lock_irqsave(&dev->event_lock, flags);
	527
	528	*out = NULL;
	529	if (list_empty(&file_priv->event_list))
	530	goto out;
	531	e = list_first_entry(&file_priv->event_list,
	532	struct drm_pending_event, link);
	533	if (e->event->length + total > max)
	534	goto out;
	535
	536	file_priv->event_space += e->event->length;
	537	list_del(&e->link);
	538	*out = e;
	539	ret = true;
	540
	541	out:
	542	spin_unlock_irqrestore(&dev->event_lock, flags);
	543	return ret;
	544	}
	545
	546	ssize_t drm_read(struct file filp, char __user buffer,
	547	size_t count, loff_t *offset)
	548	{
	549	struct drm_file *file_priv = filp->private_data;
	550	struct drm_pending_event *e;
	551	size_t total;
	552	ssize_t ret;
	553
	554	ret = wait_event_interruptible(file_priv->event_wait,
	555	!list_empty(&file_priv->event_list));
	556	if (ret < 0)
	557	return ret;
	558
	559	total = 0;
	560	while (drm_dequeue_event(file_priv, total, count, &e)) {
	561	if (copy_to_user(buffer + total,
	562	e->event, e->event->length)) {
	563	total = -EFAULT;
	564	break;
	565	}
	566
	567	total += e->event->length;
	568	e->destroy(e);
	569	}
	570
	571	return total;
	572	}
	573	EXPORT_SYMBOL(drm_read);
	574
1da177e4 LT	575	unsigned int drm_poll(struct file filp, struct poll_table_struct wait)
1da177e4 LT	576	{
c9a9c5e0 KH	577	struct drm_file *file_priv = filp->private_data;
	578	unsigned int mask = 0;
	579
	580	poll_wait(filp, &file_priv->event_wait, wait);
	581
	582	if (!list_empty(&file_priv->event_list))
	583	mask \|= POLLIN \| POLLRDNORM;
	584
	585	return mask;
1da177e4	586	}
b5e89ed5	587	EXPORT_SYMBOL(drm_poll);