[net-next-2.6.git] / drivers / char / 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 "drmP.h"
#include <linux/poll.h>

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

static int drm_setup(drm_device_t * dev)
{
	int i;
	int ret;

	if (dev->driver->presetup) {
		ret = dev->driver->presetup(dev);
		if (ret != 0)
			return ret;
	}

	atomic_set(&dev->ioctl_count, 0);
	atomic_set(&dev->vma_count, 0);
	dev->buf_use = 0;
	atomic_set(&dev->buf_alloc, 0);

	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) {
		i = drm_dma_setup(dev);
		if (i < 0)
			return i;
	}

	for (i = 0; i < DRM_ARRAY_SIZE(dev->counts); i++)
		atomic_set(&dev->counts[i], 0);

	for (i = 0; i < DRM_HASH_SIZE; i++) {
		dev->magiclist[i].head = NULL;
		dev->magiclist[i].tail = NULL;
	}

	dev->ctxlist = drm_alloc(sizeof(*dev->ctxlist), DRM_MEM_CTXLIST);
	if (dev->ctxlist == NULL)
		return -ENOMEM;
	memset(dev->ctxlist, 0, sizeof(*dev->ctxlist));
	INIT_LIST_HEAD(&dev->ctxlist->head);

	dev->vmalist = NULL;
	dev->sigdata.lock = dev->lock.hw_lock = NULL;
	init_waitqueue_head(&dev->lock.lock_queue);
	dev->queue_count = 0;
	dev->queue_reserved = 0;
	dev->queue_slots = 0;
	dev->queuelist = NULL;
	dev->irq_enabled = 0;
	dev->context_flag = 0;
	dev->interrupt_flag = 0;
	dev->dma_flag = 0;
	dev->last_context = 0;
	dev->last_switch = 0;
	dev->last_checked = 0;
	init_waitqueue_head(&dev->context_wait);
	dev->if_version = 0;

	dev->ctx_start = 0;
	dev->lck_start = 0;

	dev->buf_async = NULL;
	init_waitqueue_head(&dev->buf_readers);
	init_waitqueue_head(&dev->buf_writers);

	DRM_DEBUG("\n");

	/*
	 * The kernel's context could be created here, but is now created
	 * in drm_dma_enqueue.  This is more resource-efficient for
	 * hardware that does not do DMA, but may mean that
	 * drm_select_queue fails between the time the interrupt is
	 * initialized and the time the queues are initialized.
	 */
	if (dev->driver->postsetup)
		dev->driver->postsetup(dev);

	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)
{
	drm_device_t *dev = NULL;
	int minor = iminor(inode);
	int retcode = 0;

	if (!((minor >= 0) && (minor < drm_cards_limit)))
		return -ENODEV;

	if (!drm_heads[minor])
		return -ENODEV;

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

	retcode = drm_open_helper(inode, filp, dev);
	if (!retcode) {
		atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
		spin_lock(&dev->count_lock);
		if (!dev->open_count++) {
			spin_unlock(&dev->count_lock);
			return drm_setup(dev);
		}
		spin_unlock(&dev->count_lock);
	}

	return retcode;
}

EXPORT_SYMBOL(drm_open);

/**
 * Release file.
 *
 * \param inode device inode
 * \param filp file pointer.
 * \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 takedown().
 */
int drm_release(struct inode *inode, struct file *filp)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev;
	int retcode = 0;

	lock_kernel();
	dev = priv->head->dev;

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

	if (dev->driver->prerelease)
		dev->driver->prerelease(dev, filp);

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

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

	if (priv->lock_count && dev->lock.hw_lock &&
	    _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) &&
	    dev->lock.filp == filp) {
		DRM_DEBUG("File %p released, freeing lock for context %d\n",
			  filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));

		if (dev->driver->release)
			dev->driver->release(dev, filp);

		drm_lock_free(dev, &dev->lock.hw_lock->lock,
			      _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));

		/* FIXME: may require heavy-handed reset of
		   hardware at this point, possibly
		   processed via a callback to the X
		   server. */
	} else if (dev->driver->release && priv->lock_count
		   && dev->lock.hw_lock) {
		/* The lock is required to reclaim buffers */
		DECLARE_WAITQUEUE(entry, current);

		add_wait_queue(&dev->lock.lock_queue, &entry);
		for (;;) {
			__set_current_state(TASK_INTERRUPTIBLE);
			if (!dev->lock.hw_lock) {
				/* Device has been unregistered */
				retcode = -EINTR;
				break;
			}
			if (drm_lock_take(&dev->lock.hw_lock->lock,
					  DRM_KERNEL_CONTEXT)) {
				dev->lock.filp = filp;
				dev->lock.lock_time = jiffies;
				atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
				break;	/* Got lock */
			}
			/* Contention */
			schedule();
			if (signal_pending(current)) {
				retcode = -ERESTARTSYS;
				break;
			}
		}
		__set_current_state(TASK_RUNNING);
		remove_wait_queue(&dev->lock.lock_queue, &entry);
		if (!retcode) {
			if (dev->driver->release)
				dev->driver->release(dev, filp);
			drm_lock_free(dev, &dev->lock.hw_lock->lock,
				      DRM_KERNEL_CONTEXT);
		}
	}

	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)
	    && !dev->driver->release) {
		dev->driver->reclaim_buffers(dev, filp);
	}

	drm_fasync(-1, filp, 0);

	down(&dev->ctxlist_sem);
	if (dev->ctxlist && (!list_empty(&dev->ctxlist->head))) {
		drm_ctx_list_t *pos, *n;

		list_for_each_entry_safe(pos, n, &dev->ctxlist->head, head) {
			if (pos->tag == priv &&
			    pos->handle != DRM_KERNEL_CONTEXT) {
				if (dev->driver->context_dtor)
					dev->driver->context_dtor(dev,
								  pos->handle);

				drm_ctxbitmap_free(dev, pos->handle);

				list_del(&pos->head);
				drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST);
				--dev->ctx_count;
			}
		}
	}
	up(&dev->ctxlist_sem);

	down(&dev->struct_sem);
	if (priv->remove_auth_on_close == 1) {
		drm_file_t *temp = dev->file_first;
		while (temp) {
			temp->authenticated = 0;
			temp = temp->next;
		}
	}
	if (priv->prev) {
		priv->prev->next = priv->next;
	} else {
		dev->file_first = priv->next;
	}
	if (priv->next) {
		priv->next->prev = priv->prev;
	} else {
		dev->file_last = priv->prev;
	}
	up(&dev->struct_sem);

	if (dev->driver->free_filp_priv)
		dev->driver->free_filp_priv(dev, priv);

	drm_free(priv, sizeof(*priv), DRM_MEM_FILES);

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

	atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
	spin_lock(&dev->count_lock);
	if (!--dev->open_count) {
		if (atomic_read(&dev->ioctl_count) || dev->blocked) {
			DRM_ERROR("Device busy: %d %d\n",
				  atomic_read(&dev->ioctl_count), dev->blocked);
			spin_unlock(&dev->count_lock);
			unlock_kernel();
			return -EBUSY;
		}
		spin_unlock(&dev->count_lock);
		unlock_kernel();
		return drm_takedown(dev);
	}
	spin_unlock(&dev->count_lock);

	unlock_kernel();

	return retcode;
}

EXPORT_SYMBOL(drm_release);

/**
 * 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,
			   drm_device_t * dev)
{
	int minor = iminor(inode);
	drm_file_t *priv;
	int ret;

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

	DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor);

	priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES);
	if (!priv)
		return -ENOMEM;

	memset(priv, 0, sizeof(*priv));
	filp->private_data = priv;
	priv->uid = current->euid;
	priv->pid = current->pid;
	priv->minor = minor;
	priv->head = drm_heads[minor];
	priv->ioctl_count = 0;
	priv->authenticated = capable(CAP_SYS_ADMIN);
	priv->lock_count = 0;

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

	down(&dev->struct_sem);
	if (!dev->file_last) {
		priv->next = NULL;
		priv->prev = NULL;
		dev->file_first = priv;
		dev->file_last = priv;
	} else {
		priv->next = NULL;
		priv->prev = dev->file_last;
		dev->file_last->next = priv;
		dev->file_last = priv;
	}
	up(&dev->struct_sem);

#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_free:
	drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
	filp->private_data = NULL;
	return ret;
}

/** No-op. */
int drm_flush(struct file *filp)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;

	DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
		  current->pid, (long)old_encode_dev(priv->head->device),
		  dev->open_count);
	return 0;
}

EXPORT_SYMBOL(drm_flush);

/** No-op. */
int drm_fasync(int fd, struct file *filp, int on)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	int retcode;

	DRM_DEBUG("fd = %d, device = 0x%lx\n", fd,
		  (long)old_encode_dev(priv->head->device));
	retcode = fasync_helper(fd, filp, on, &dev->buf_async);
	if (retcode < 0)
		return retcode;
	return 0;
}

EXPORT_SYMBOL(drm_fasync);

/** No-op. */
unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
{
	return 0;
}

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
	37	#include "drmP.h"
	38	#include <linux/poll.h>
	39
b5e89ed5 DA	40	static int drm_open_helper(struct inode inode, struct file filp,
b5e89ed5 DA	41	drm_device_t * dev);
c94f7029	42
b5e89ed5	43	static int drm_setup(drm_device_t * dev)
1da177e4 LT	44	{
	45	int i;
	46	int ret;
	47
b5e89ed5 DA	48	if (dev->driver->presetup) {
	49	ret = dev->driver->presetup(dev);
	50	if (ret != 0)
1da177e4 LT	51	return ret;
	52	}
	53
b5e89ed5 DA	54	atomic_set(&dev->ioctl_count, 0);
b5e89ed5 DA	55	atomic_set(&dev->vma_count, 0);
1da177e4	56	dev->buf_use = 0;
b5e89ed5	57	atomic_set(&dev->buf_alloc, 0);
1da177e4	58
b5e89ed5 DA	59	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) {
	60	i = drm_dma_setup(dev);
	61	if (i < 0)
1da177e4 LT	62	return i;
	63	}
	64
b5e89ed5 DA	65	for (i = 0; i < DRM_ARRAY_SIZE(dev->counts); i++)
b5e89ed5 DA	66	atomic_set(&dev->counts[i], 0);
1da177e4	67
b5e89ed5	68	for (i = 0; i < DRM_HASH_SIZE; i++) {
1da177e4 LT	69	dev->magiclist[i].head = NULL;
	70	dev->magiclist[i].tail = NULL;
	71	}
	72
b5e89ed5 DA	73	dev->ctxlist = drm_alloc(sizeof(*dev->ctxlist), DRM_MEM_CTXLIST);
	74	if (dev->ctxlist == NULL)
	75	return -ENOMEM;
1da177e4 LT	76	memset(dev->ctxlist, 0, sizeof(*dev->ctxlist));
	77	INIT_LIST_HEAD(&dev->ctxlist->head);
	78
	79	dev->vmalist = NULL;
	80	dev->sigdata.lock = dev->lock.hw_lock = NULL;
b5e89ed5	81	init_waitqueue_head(&dev->lock.lock_queue);
1da177e4 LT	82	dev->queue_count = 0;
	83	dev->queue_reserved = 0;
	84	dev->queue_slots = 0;
	85	dev->queuelist = NULL;
	86	dev->irq_enabled = 0;
	87	dev->context_flag = 0;
	88	dev->interrupt_flag = 0;
	89	dev->dma_flag = 0;
	90	dev->last_context = 0;
	91	dev->last_switch = 0;
	92	dev->last_checked = 0;
b5e89ed5	93	init_waitqueue_head(&dev->context_wait);
1da177e4 LT	94	dev->if_version = 0;
	95
	96	dev->ctx_start = 0;
	97	dev->lck_start = 0;
	98
1da177e4	99	dev->buf_async = NULL;
b5e89ed5 DA	100	init_waitqueue_head(&dev->buf_readers);
b5e89ed5 DA	101	init_waitqueue_head(&dev->buf_writers);
1da177e4	102
b5e89ed5	103	DRM_DEBUG("\n");
1da177e4 LT	104
	105	/*
	106	* The kernel's context could be created here, but is now created
b5e89ed5	107	* in drm_dma_enqueue. This is more resource-efficient for
1da177e4 LT	108	* hardware that does not do DMA, but may mean that
	109	* drm_select_queue fails between the time the interrupt is
	110	* initialized and the time the queues are initialized.
	111	*/
	112	if (dev->driver->postsetup)
	113	dev->driver->postsetup(dev);
	114
	115	return 0;
	116	}
	117
	118	/**
	119	* Open file.
b5e89ed5	120	*
1da177e4 LT	121	* \param inode device inode
	122	* \param filp file pointer.
	123	* \return zero on success or a negative number on failure.
	124	*
	125	* Searches the DRM device with the same minor number, calls open_helper(), and
	126	* increments the device open count. If the open count was previous at zero,
	127	* i.e., it's the first that the device is open, then calls setup().
	128	*/
b5e89ed5	129	int drm_open(struct inode inode, struct file filp)
1da177e4 LT	130	{
	131	drm_device_t *dev = NULL;
	132	int minor = iminor(inode);
	133	int retcode = 0;
	134
	135	if (!((minor >= 0) && (minor < drm_cards_limit)))
	136	return -ENODEV;
b5e89ed5	137
1da177e4 LT	138	if (!drm_heads[minor])
	139	return -ENODEV;
	140
	141	if (!(dev = drm_heads[minor]->dev))
	142	return -ENODEV;
b5e89ed5 DA	143
	144	retcode = drm_open_helper(inode, filp, dev);
	145	if (!retcode) {
	146	atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
	147	spin_lock(&dev->count_lock);
	148	if (!dev->open_count++) {
	149	spin_unlock(&dev->count_lock);
	150	return drm_setup(dev);
1da177e4	151	}
b5e89ed5	152	spin_unlock(&dev->count_lock);
1da177e4 LT	153	}
	154
	155	return retcode;
	156	}
b5e89ed5	157
1da177e4 LT	158	EXPORT_SYMBOL(drm_open);
	159
	160	/**
	161	* Release file.
	162	*
	163	* \param inode device inode
	164	* \param filp file pointer.
	165	* \return zero on success or a negative number on failure.
	166	*
	167	* If the hardware lock is held then free it, and take it again for the kernel
	168	* context since it's necessary to reclaim buffers. Unlink the file private
	169	* data from its list and free it. Decreases the open count and if it reaches
	170	* zero calls takedown().
	171	*/
b5e89ed5	172	int drm_release(struct inode inode, struct file filp)
1da177e4 LT	173	{
	174	drm_file_t *priv = filp->private_data;
	175	drm_device_t *dev;
	176	int retcode = 0;
	177
	178	lock_kernel();
	179	dev = priv->head->dev;
	180
b5e89ed5	181	DRM_DEBUG("open_count = %d\n", dev->open_count);
1da177e4 LT	182
	183	if (dev->driver->prerelease)
	184	dev->driver->prerelease(dev, filp);
	185
	186	/* ========================================================
	187	* Begin inline drm_release
	188	*/
	189
b5e89ed5 DA	190	DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
	191	current->pid, (long)old_encode_dev(priv->head->device),
	192	dev->open_count);
	193
	194	if (priv->lock_count && dev->lock.hw_lock &&
	195	_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) &&
	196	dev->lock.filp == filp) {
	197	DRM_DEBUG("File %p released, freeing lock for context %d\n",
	198	filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
1da177e4	199
1da177e4 LT	200	if (dev->driver->release)
	201	dev->driver->release(dev, filp);
	202
b5e89ed5 DA	203	drm_lock_free(dev, &dev->lock.hw_lock->lock,
b5e89ed5 DA	204	_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
1da177e4	205
b5e89ed5 DA	206	/* FIXME: may require heavy-handed reset of
	207	hardware at this point, possibly
	208	processed via a callback to the X
	209	server. */
	210	} else if (dev->driver->release && priv->lock_count
	211	&& dev->lock.hw_lock) {
1da177e4	212	/* The lock is required to reclaim buffers */
b5e89ed5	213	DECLARE_WAITQUEUE(entry, current);
1da177e4	214
b5e89ed5	215	add_wait_queue(&dev->lock.lock_queue, &entry);
1da177e4 LT	216	for (;;) {
1da177e4 LT	217	__set_current_state(TASK_INTERRUPTIBLE);
b5e89ed5	218	if (!dev->lock.hw_lock) {
1da177e4 LT	219	/* Device has been unregistered */
	220	retcode = -EINTR;
	221	break;
	222	}
b5e89ed5 DA	223	if (drm_lock_take(&dev->lock.hw_lock->lock,
	224	DRM_KERNEL_CONTEXT)) {
	225	dev->lock.filp = filp;
1da177e4	226	dev->lock.lock_time = jiffies;
b5e89ed5	227	atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
1da177e4 LT	228	break; /* Got lock */
1da177e4 LT	229	}
b5e89ed5	230	/* Contention */
1da177e4	231	schedule();
b5e89ed5	232	if (signal_pending(current)) {
1da177e4 LT	233	retcode = -ERESTARTSYS;
	234	break;
	235	}
	236	}
	237	__set_current_state(TASK_RUNNING);
b5e89ed5 DA	238	remove_wait_queue(&dev->lock.lock_queue, &entry);
b5e89ed5 DA	239	if (!retcode) {
1da177e4 LT	240	if (dev->driver->release)
1da177e4 LT	241	dev->driver->release(dev, filp);
b5e89ed5 DA	242	drm_lock_free(dev, &dev->lock.hw_lock->lock,
b5e89ed5 DA	243	DRM_KERNEL_CONTEXT);
1da177e4 LT	244	}
1da177e4 LT	245	}
b5e89ed5 DA	246
	247	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)
	248	&& !dev->driver->release) {
1da177e4 LT	249	dev->driver->reclaim_buffers(dev, filp);
	250	}
	251
b5e89ed5	252	drm_fasync(-1, filp, 0);
1da177e4	253
b5e89ed5 DA	254	down(&dev->ctxlist_sem);
b5e89ed5 DA	255	if (dev->ctxlist && (!list_empty(&dev->ctxlist->head))) {
1da177e4 LT	256	drm_ctx_list_t pos, n;
1da177e4 LT	257
b5e89ed5 DA	258	list_for_each_entry_safe(pos, n, &dev->ctxlist->head, head) {
	259	if (pos->tag == priv &&
	260	pos->handle != DRM_KERNEL_CONTEXT) {
1da177e4	261	if (dev->driver->context_dtor)
b5e89ed5 DA	262	dev->driver->context_dtor(dev,
b5e89ed5 DA	263	pos->handle);
1da177e4	264
b5e89ed5	265	drm_ctxbitmap_free(dev, pos->handle);
1da177e4	266
b5e89ed5 DA	267	list_del(&pos->head);
b5e89ed5 DA	268	drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST);
1da177e4 LT	269	--dev->ctx_count;
	270	}
	271	}
	272	}
b5e89ed5	273	up(&dev->ctxlist_sem);
1da177e4	274
b5e89ed5 DA	275	down(&dev->struct_sem);
b5e89ed5 DA	276	if (priv->remove_auth_on_close == 1) {
1da177e4	277	drm_file_t *temp = dev->file_first;
b5e89ed5	278	while (temp) {
1da177e4 LT	279	temp->authenticated = 0;
	280	temp = temp->next;
	281	}
	282	}
b5e89ed5	283	if (priv->prev) {
1da177e4 LT	284	priv->prev->next = priv->next;
1da177e4 LT	285	} else {
b5e89ed5	286	dev->file_first = priv->next;
1da177e4	287	}
b5e89ed5	288	if (priv->next) {
1da177e4 LT	289	priv->next->prev = priv->prev;
1da177e4 LT	290	} else {
b5e89ed5	291	dev->file_last = priv->prev;
1da177e4	292	}
b5e89ed5 DA	293	up(&dev->struct_sem);
b5e89ed5 DA	294
1da177e4 LT	295	if (dev->driver->free_filp_priv)
	296	dev->driver->free_filp_priv(dev, priv);
	297
b5e89ed5	298	drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
1da177e4 LT	299
	300	/* ========================================================
	301	* End inline drm_release
	302	*/
	303
b5e89ed5 DA	304	atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
	305	spin_lock(&dev->count_lock);
	306	if (!--dev->open_count) {
	307	if (atomic_read(&dev->ioctl_count) \|\| dev->blocked) {
	308	DRM_ERROR("Device busy: %d %d\n",
	309	atomic_read(&dev->ioctl_count), dev->blocked);
	310	spin_unlock(&dev->count_lock);
1da177e4 LT	311	unlock_kernel();
	312	return -EBUSY;
	313	}
b5e89ed5	314	spin_unlock(&dev->count_lock);
1da177e4	315	unlock_kernel();
b5e89ed5	316	return drm_takedown(dev);
1da177e4	317	}
b5e89ed5	318	spin_unlock(&dev->count_lock);
1da177e4 LT	319
	320	unlock_kernel();
	321
	322	return retcode;
	323	}
b5e89ed5	324
1da177e4 LT	325	EXPORT_SYMBOL(drm_release);
	326
	327	/**
b5e89ed5	328	* Called whenever a process opens /dev/drm.
1da177e4 LT	329	*
	330	* \param inode device inode.
	331	* \param filp file pointer.
	332	* \param dev device.
	333	* \return zero on success or a negative number on failure.
b5e89ed5	334	*
1da177e4 LT	335	* Creates and initializes a drm_file structure for the file private data in \p
	336	* filp and add it into the double linked list in \p dev.
	337	*/
b5e89ed5 DA	338	static int drm_open_helper(struct inode inode, struct file filp,
b5e89ed5 DA	339	drm_device_t * dev)
1da177e4	340	{
b5e89ed5 DA	341	int minor = iminor(inode);
b5e89ed5 DA	342	drm_file_t *priv;
1da177e4 LT	343	int ret;
1da177e4 LT	344
b5e89ed5 DA	345	if (filp->f_flags & O_EXCL)
	346	return -EBUSY; /* No exclusive opens */
	347	if (!drm_cpu_valid())
	348	return -EINVAL;
1da177e4 LT	349
	350	DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor);
	351
b5e89ed5 DA	352	priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES);
	353	if (!priv)
	354	return -ENOMEM;
1da177e4 LT	355
1da177e4 LT	356	memset(priv, 0, sizeof(*priv));
b5e89ed5 DA	357	filp->private_data = priv;
	358	priv->uid = current->euid;
	359	priv->pid = current->pid;
	360	priv->minor = minor;
	361	priv->head = drm_heads[minor];
	362	priv->ioctl_count = 0;
1da177e4	363	priv->authenticated = capable(CAP_SYS_ADMIN);
b5e89ed5	364	priv->lock_count = 0;
1da177e4 LT	365
1da177e4 LT	366	if (dev->driver->open_helper) {
b5e89ed5	367	ret = dev->driver->open_helper(dev, priv);
1da177e4 LT	368	if (ret < 0)
	369	goto out_free;
	370	}
	371
	372	down(&dev->struct_sem);
	373	if (!dev->file_last) {
b5e89ed5 DA	374	priv->next = NULL;
b5e89ed5 DA	375	priv->prev = NULL;
1da177e4	376	dev->file_first = priv;
b5e89ed5	377	dev->file_last = priv;
1da177e4	378	} else {
b5e89ed5 DA	379	priv->next = NULL;
b5e89ed5 DA	380	priv->prev = dev->file_last;
1da177e4	381	dev->file_last->next = priv;
b5e89ed5	382	dev->file_last = priv;
1da177e4 LT	383	}
	384	up(&dev->struct_sem);
	385
	386	#ifdef __alpha__
	387	/*
	388	* Default the hose
	389	*/
	390	if (!dev->hose) {
	391	struct pci_dev *pci_dev;
	392	pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
	393	if (pci_dev) {
	394	dev->hose = pci_dev->sysdata;
	395	pci_dev_put(pci_dev);
	396	}
	397	if (!dev->hose) {
	398	struct pci_bus *b = pci_bus_b(pci_root_buses.next);
b5e89ed5 DA	399	if (b)
b5e89ed5 DA	400	dev->hose = b->sysdata;
1da177e4 LT	401	}
	402	}
	403	#endif
	404
	405	return 0;
b5e89ed5	406	out_free:
1da177e4	407	drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
b5e89ed5	408	filp->private_data = NULL;
1da177e4 LT	409	return ret;
	410	}
	411
	412	/** No-op. */
	413	int drm_flush(struct file *filp)
	414	{
b5e89ed5 DA	415	drm_file_t *priv = filp->private_data;
b5e89ed5 DA	416	drm_device_t *dev = priv->head->dev;
1da177e4 LT	417
1da177e4 LT	418	DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
b5e89ed5 DA	419	current->pid, (long)old_encode_dev(priv->head->device),
b5e89ed5 DA	420	dev->open_count);
1da177e4 LT	421	return 0;
1da177e4 LT	422	}
b5e89ed5	423
1da177e4 LT	424	EXPORT_SYMBOL(drm_flush);
	425
	426	/** No-op. */
	427	int drm_fasync(int fd, struct file *filp, int on)
	428	{
b5e89ed5 DA	429	drm_file_t *priv = filp->private_data;
	430	drm_device_t *dev = priv->head->dev;
	431	int retcode;
1da177e4	432
b5e89ed5 DA	433	DRM_DEBUG("fd = %d, device = 0x%lx\n", fd,
b5e89ed5 DA	434	(long)old_encode_dev(priv->head->device));
1da177e4	435	retcode = fasync_helper(fd, filp, on, &dev->buf_async);
b5e89ed5 DA	436	if (retcode < 0)
b5e89ed5 DA	437	return retcode;
1da177e4 LT	438	return 0;
1da177e4 LT	439	}
b5e89ed5	440
1da177e4 LT	441	EXPORT_SYMBOL(drm_fasync);
	442
	443	/** No-op. */
	444	unsigned int drm_poll(struct file filp, struct poll_table_struct wait)
	445	{
	446	return 0;
	447	}
1da177e4	448
b5e89ed5	449	EXPORT_SYMBOL(drm_poll);